Overall loop feedback design, each channel with a ECC83S tube for voltage amplification, DAN1 connects cathode follower as signal buffer to get low output resistance. 6Z4 rectifier tube is used in high pressure parts. Zu Favoriten hinzufügen Verkäufer Newsletter abonnieren Neuankömmling Endet bald Feedback anzeigen Über uns Kontaktiere uns Alle Kategorien anzeigen Zusatzartikel Digitaler Verstärker Röhrenverstärker Hi-Fi Verstärker Vorverstärker & Phono Stage Kopfhörerverstärker D/A Wandler & Audio Adapter Audio-Splitter/Umschalter Audioprozessor Musikspektrum & Uhr Plattenspieler/Turntable-Teile Chassis & Gehäuse Netzteil Audio Board & Bausatz Audio Kabel Funktechnik & Kommunikation Audio Zubehör Andere Sonstiges Zuhause Feedback Verkäufer speichern Neu gelistet Endet bald Kontaktiere uns Shop-Kategorie Zusatzartikel Digitaler Verstärker Mono Kanal 2.0 Kanal 2.1 Kanal 4.0 Kanal 5.1 Kanal Multifunktion Röhrenverstärker Hi-Fi Verstärker Vorverstärker & Phono Stage Kopfhörerverstärker D/A Wandler & Audio Adapter Audio-Splitter/Umschalter Audioprozessor Musikspektrum & Uhr Plattenspieler/Turntable-Teile Chassis & Gehäuse Netzteil Audio Board & Bausatz Audio Kabel Funktechnik & Kommunikation Audio Zubehör Andere Sonstiges Abonnieren Sie unseren Newsletter Erhalten Sie unsere E-Mail-Newsletter über neue Artikel und Sonderaktionen ! Jetzt registrieren ! Heim-Audio HiFi Stereo Röhrenvorverstärker Valve Tube Preamplifier--Defective Artikelbeschreibung Shipping from Germany, 1-3 days to most DE regions and 2-8 days to Most EU countries. Please Note: the transformer is 110V and was powered by 220V mains supply by last customer, so the power part was broken, need to be changed and repaired by yourself. Warm tips: 3PCS shuguang 12AX7 tube has been upgraded to JJ ECC83S. Introduction: Overall loop feedback design, each channel with a ECC83S tube for voltage amplification, DAN1 connects cathode follower as signal buffer to get low output resistance. 6Z4 rectifier tube is used in high pressure parts. HiFi clear sound: the treble is delicate and not harsh, the midrange is warm and the bass is full. The vocals are natural and delicate, the strings are smooth. High-end Materials: Japan ALPS27 potentiometer American CMC gold-plated RCA terminals All high-grade aluminum alloy chassis Philips, WIMA high voltage capacitor US military specification DALE resistor Japan KOA series gold plated pin tube sockets Dimensions(W*H*D): 202 * 80 * 282 mm Working voltage:110V-115V / 220V-240V Packing List: 1* Tube Preamp 3* JJ ECC83S Tube 1* Power Cord Zahlung Schnelle Lieferung Rücknahmegarantie Über uns Kontaktiere uns Zahlung Sichere und sichere Zahlung per PayPal. Schnelle Lieferung Die Artikel befinden sich in Deutschland und werden innerhalb von 1 Werktag, 1-2 Werktagen nach Deutschland und 2-8 Werktagen nach den meisten EU-Lndern versendet. Rücknahmegarantie Kostenlose Rcksendung innerhalb von 30 Tagen Wir bieten eine kostenlose Rckgabe innerhalb von 30 Tagen fr alle Artikel, die Sie bei eBay gekauft haben. Die vollstndige Rckerstattung und die Rcksendung erfolgen. Auf alle Artikel wird eine Garantie von 1 Jahr gewhrt (ausgenommen: 1. Beschdigungen oder Missbrauch durch den Menschen. 2. Audiozubehr und Verbrauchsmaterialien wie Vakuumrhren). Wenn Sie mit unseren Produkten und unserem Service zufrieden sind, hinterlassen Sie bitte einen 5-Sterne . Positives Feedback ist fr uns genauso wichtig wie unser Leben. Bitte kontaktieren Sie uns, bevor Sie ein neutrales oder negatives Feedback abgeben. Wir werden bessere Lsungen anbieten, bis Sie zufrieden sind. Über uns Douk Audio / Nobsound Studio wurde 2013 in Shenzhen, CHINA, gegrndet. Wir besitzen mehrere Marken, darunter Douk Audio / Nobsound / Little Bear usw. Als professionelles Audio-Unternehmen sind wir bestrebt, die besten Produkte zu den niedrigsten Preisen zu entwickeln und herzustellen, um HiFi erschwinglich zu machen. Wir werden keine Mhen scheuen, groartige Produkte und Dienstleistungen fr unsere Kunden anzubieten und das Hrerlebnis unserer Kunden zu verbessern. Kontaktiere uns Bitte zgern Sie nicht, uns zu kontaktieren, wenn Sie Fragen oder Kommentare zu unseren Artikeln haben. Unsere Arbeitszeit ist von Montag bis Freitag von 9.00 bis 18.00 Uhr (Pekinger Zeit). Bitte erlauben Sie uns, Ihnen zu Beginn der nchsten Woche zu antworten und keine negativen / neutralen Bewertungen oder Beschwerden whrend unseres Urlaubs zu hinterlassen. Vielen Dank fr Ihr Verstndnis und Ihre Mitarbeit. Zuhause Feedback Verkäufer speichern Neu gelistet Endet bald Kontaktiere uns

Vintage Elstone SR250 Valve Audio Power Transformer. Tested and in working order. All voltages present on corresponding tappings. Some minor surface rust. 200-250v input 250-0-250v 80mA HT winding 6.3-4-0v 4A Valve heater winding 5-4-0v 2A rectifier winding Perfect for a valve amp project. Please see photos! Will be well packaged for shipping!

ONE RCA 7905 TALL BOY TUBE Listing and template services provided by inkFrog

ONE RCA 6EW6 VACUUM TUBES NOS NIB Listing and template services provided by inkFrog

* * * * * * * * * * *   TUNG SOL 1C5GT Audio Electronic Vintage Radio TV Valve HAM Vacuum NOS NIB Tube NOS NIB TESTED * * * * * * * ************************************************************************************************************ Listing and template services provided by inkFrog

ONE RCA 6EW6 VACUUM TUBES NOS NIB Listing and template services provided by inkFrog

****************************************************ONE ZENITH 6EW6 VACUUM TUBES NOS NIBAUCTION IS FOR ONE TUBE.5 ARE AVAILABLE.***************************************************** Listing and template services provided by inkFrog

One (1) 6V6GT Raytheon vintage vacuum tube, made in USA, tube has black ribbed plates, chromed domes, smoked glass, tube tests: 86 % Price is for all tubes pictured. Tube did not have original box, I assume it as used. Tubes are tested for emission, as well as for shorts, life test and grid leakage on calibrated Sencore Mighty Mite tube tester, on scale 1-120, good quality on my Sencore starts at 70. We test all tubes we sell! We will combine shipping! Check out my other tubes!

One (1) 6GW8 ECL86 GE by Mullard vintage vacuum tube, made in Great Britain, tube has black smooth plate, top O and foil getter, tube tests: 88, 86 % Price is for all tubes pictured. Tube did not have original box, I assume it as used. We test all tubes we sell! We will combine shipping! Check out my other tubes! Tubes are tested for emission, as well as for shorts, life test and grid leakage on calibrated Sencore Mighty Mite tube tester, on scale 1-120, good quality on my Sencore starts at 70.

Add to Favorites Seller Join newsletter New Arrival Ending Soon View Feedback About Us Contact Us View All Categories Nobsound & Douk Audio Add-on Items US Warehouse UK Warehouse DE Warehouse AU Warehouse Digital Amplifier Tube Amplifier Audio Amplifier Preamp & Phono Stage Headphone Amplifier DAC & Audio Adapter Audio Splitter/Switcher Audio Processor Audio Player Music Spectrum & Clock Empty Chassis Record Player & Turntable Part Power Supply Vacuum Tubes Hi-Fi Speakers Hi-Fi Cable Transformer Radio Communication Audio Accessories Other Home Feedback Save Seller New Listed Ending Soon Contact us Store Category Nobsound & Douk Audio Add-on Items US Warehouse Add-on Items Amplifier Preamp & Phono Stage Headphone Amplifier DAC & Audio Adapter Audio Splitter/Switcher Music Spectrum & Clock Audio Accessories Other UK Warehouse Add-on Items Digital Amplifier Tube Amplifier Hi-Fi Amplifier Preamp & Phono Stage Headphone Amplifier DAC & Audio Adapter Audio Splitter/Switcher Audio Processor Music Spectrum & Clock Record Player & Turntable Part Audio Board & DIY Kit Audio Accessories Other DE Warehouse Add-on Items Digital Amplifier Tube Amplifier Hi-Fi Amplifier Preamp & Phono Stage Headphone Amplifier DAC & Audio Adapter Audio Splitter/Switcher Audio Processor Music Spectrum & Clock Aluminum Chassis Record Player & Turntable Part Audio Board & DIY Kit Radio Communication Audio Accessories Other AU Warehouse Add-on Items Amplifier Preamp & Phono Stage Headphone Amplifier DAC & Audio Adapter Audio Splitter/Switcher Music Spectrum & Clock Audio Accessories Other Digital Amplifier Multi-Function Mono Channel 2.0 Channel 2.1 Channel 4.0 Channel 5.1 Channel Tube Amplifier DIY Kit Hybrid Amplifier Mini Tube Amplifier EL34 Tube Amplifier KT88 Tube Amplifier 300B Tube Amplifier Other Tube Amplifier Audio Amplifier Mini Amplifier Integrated Amplifier Power Amplifier Audio Board & DIY Kit Preamp & Phono Stage Tube Preamp Digital Preamp Phono Preamp Passive Preamp Audio Board & DIY Kit Headphone Amplifier Mini Headphone Amp Desktop Headphone Amp Portable Headphone Amp Tube Headphone Amp DAC & Audio Adapter Audio Adapter USB DAC Bluetooth Receiver/Transmitter Digital Interface Audio Board & DIY Kit Audio Splitter/Switcher Speaker Switcher Bluetooth & XLR & MIC 2 Way 3 Way 4 Way Multiple Way Audio Processor Guitar Effects Equalizer Audio Mixer Noise Isolator Audio Player Digital Player Record Player CD Player Portable Player Music Spectrum & Clock Analog VU Meter Tube Sound Level Meter LED Sound Level Meter VFD Audio Spectrum LED Clock Nixie Tube Clock VFD Tube Clock IPS Nixie Clock Oscilloscope Tube Clock Board & DIY Kit Other Empty Chassis Small-sized Medium-sized Large-sized Personalized Record Player & Turntable Part Set-up Transformer Record Weight & Clamp Cleaning Kit Scale Gauge Platter Mat Dust Cover Needle Other Power Supply Linear Power Supply Switching Power Supply Power Supply Filter USB Charging Hub Board & DIY Kit Vacuum Tubes Shuguang Tube PSVANE Tube Tube Socket Tube Tester Probe Hi-Fi Speakers Frequency Divider Speaker Unit Hi-Fi Cable RCA Audio Cable 1/8 & 1/4 Stereo Jack Cable Speaker Cable USB Cable Optical Fiber Cable Conversion Cable Dock Cable Other Transformer Toroidal transformer Output Transformer Other Radio Communication Tesla Coil Transmitter & Receiver Signal Generator Antennas & Tuners Shortwave Radios Ham Amateur Radio Audio Accessories Volume Controller Mount Stand Bracket Feet & Pads Op Amp Headphone Current Meter Other Other Join Our Newsletter Receive our email newsletters about new items and special promotions! Sign Up Now ! 6N1 6P1 Vacuum Tube Amplifier Stereo Valve Audio Amp Board Item description Product descriptionClassic 6N1 + 6P1 stereo amplifier board 3W +3W: high quality epoxy glass fiber board, thickness 2mm.Dimensions: 185 × 57 mm, classic circuit, filament AC power supply, filament AC power supply, all ground a little ground.Finished board access to power transformers, speaker functionalityAC input high-voltage: 230V ~ 0 ~ 230V 100mA, three groups of filament input voltage: 6.3V, 6N1 0.6A, 6P1 1A.Notice: Due to different production batches, board color may vary. When the component parameters on the board are different from the schematic, the component parameters on the board are unchangedIf your power transformer is 230V, the bridge rectifier has four diodes, and the board has been suited to increase the two 1N4007 diode position.refer to chart below Package includes: 1 x amplifier board 3 x tubes Payment Delivery details Return Policy About us Contact us Payment Safe and secure payment by PayPal. Delivery details Please leave VALID TELEPHONE NUMBER which is necessary and very important. Customs Clearance We are NOT responsible for any customs duties fee. We are NOT responsible for any import tax or customs delay. Most item will be shipped within 2 working days. For package less than 2KG, we use Airmail (10-25 days to most countries) and for package over than 2KG we use Expedited Service such as DHL, UPS and FEDEX (5-8 days to most countries). Return Policy Free Return Within 30 DaysWe provide return within 30 days for all items you bought on eBay, full refund and return shipping will be provided. 1-year warranty is provided for all items(Excluding: 1. Man-made damage or misuse. 2. Audio accessories and consumables such as vacuum tubes). If you are satisfied with our products and service please leave a 5-star . Feedback is very important to us just like our lives, please DO contact us before you leave a neutral or negative feedback, we will provide better solutions until you are satisfied. About us Douk Audio / Nobsound Studio was founded in 2013 in Shenzhen CHINA, we own several brands including Douk Audio / Nobsound / Little Bear etc. As a professional audio company, we are dedicated to design and produce the best products at the lowest prices to make HiFi affordable. We will spare no efforts to bring great products and service for customers and extremely to improve our customers listening experience. Contact us Please dont hesitate to contact us if you have any questions or comments about our items. And our working time is from Monday to Friday between 9:00 am to 06:00 pm(Beijing Time), which means we can keep on-line at: Working time Beijing(CN)Monday-Friday09:00 AM - 18:00 AMNew York(US)Sunday to Thursday08:00 PM - 05:00 AMLondon(UK)Monday-Friday01:00 AM - 10:00 AMParis(FR)Monday-Friday02:00 AM - 11:00 AM During holiday, please allow us to response you early next week. Please dont leave any negative / neutral feedback or make dispute/claim on our non-working time, thank you for your understanding and cooperation. Home Feedback Save Seller New Listed Ending Soon Contact us

filament & performance tested good, please see photo. Cossor 210VPT = CV171 = K50M = CV1083 = NR41 = VP21 = Pentode Mutual conductance mu=1.1mA/V (=100%) (2nd scale of the meter)Gas leakage tested good Notes : For overseas buyers, any applicable customs charges are the responsibility of the buyer

As shown, please see images. NAtional Union US Army Signal CorpsNew old stock 1S4 ( 4 ) = CV783 = DL91 = Beam Tetrode Will try to combine postage for overseas buyers for valve auction items closing on the same day. (limit at 2kg shipment ). Please wait for invoice to arrive before paying. Typically there should be at least 50% reduction for postage on the second item. Notes : For overseas buyers, any applicable customs charges are the responsibility of the buyer

As shown, please see images.New Old stock Mullard EAB1, tested good Will try to combine postage for overseas buyers for valve auction items closing on the same day. (limit at 2kg shipment ). Please wait for invoice to arrive before paying. Typically there should be at least 50% reduction for postage on the second item. Notes : For overseas buyers, any applicable customs charges are the responsibility of the buyer

filament & performance tested ok, please see photo. Gas & cathode leakage also tested ok. 6K6G = CV1938 = Pentode mu=1.9mA/V (spec=1.6 ) (2nd to top scale of the meter ) Notes : For overseas buyers, any applicable customs charges are the responsibility of the buyer

filament & performance tested good, please see photo. R42 = UU4 = CV3759 = MU12 = Rectifier Will try to combine postage for overseas buyers for valve auction items closing on the same day. (limit at 2kg shipment ). Please wait for invoice to arrive before paying. Typically there should be at least 50% reduction for postage on the second item Notes : For overseas buyers, any applicable customs charges are the responsibility of the buyer

Tested on a fully restored TV7-DU, by Dan Nelson, pictures of evidence for this included in the listing. It was restored and calibrated on October 21st 2021. Tubes are tested for shorts. PC= Plate Current DC= Date Code Please note, TV7 data minimum is equal to 60%. For example, (insert model number here) min value 60. If the tube tests at minimum 60, that is equal to 60%. The number over (/) is the minimum test data result as described in the TV7 DU tube testing manual. So 60/ (min) 60 = 60% triode 1 9.9/32 PC 1 triode 2 17.5/32 PC 1.9 I mark all my tubes, so please dont waste your time seeking to send me back your old dead tubes. All testers read differently. I have sought to have my tester as accurate as possible. I will not be giving partial refunds because you have received different test result. All tubes will be shipped well, an example of how I pack is pictured in the listing. (obviously these tubes are not included) I wont be lying on a customs form I combine shipping. If the tubes are of significant value, the postage will be extra due to insurance.

Tested on a fully restored TV7-DU, by Dan Nelson, pictures of evidence for this included in the listing. It was restored and calibrated on October 21st 2021. Tubes are tested for shorts. PC= Plate Current DC= Date Code Please note, TV7 data minimum is equal to 60%. For example, (insert model number here) min value 60. If the tube tests at minimum 60, that is equal to 60%. The number over (/) is the minimum test data result as described in the TV7 DU tube testing manual. So 60/ (min) 60 = 60% tests nos. cant verify that it is a genuine nos D getter 98/50 PC= 11.9 101.3/50 PC= 12.2 I mark all my tubes, so please dont waste your time seeking to send me back your old dead tubes. All testers read differently. I have sought to have my tester as accurate as possible. I will not be giving partial refunds because you have received different test result. All tubes will be shipped well, an example of how I pack is pictured in the listing. (obviously these tubes are not included) I wont be lying on a customs form I combine shipping. If the tubes are of significant value, the postage will be extra due to insurance.

Tested on a fully restored TV7-DU, by Dan Nelson, pictures of evidence for this included in the listing. It was restored and calibrated on October 21st 2021. Tubes are tested for shorts. PC= Plate Current DC= Date Code Please note, TV7 data minimum is equal to 60%. For example, (insert model number here) min value 60. If the tube tests at minimum 60, that is equal to 60%. The number over (/) is the minimum test data result as described in the TV7 DU tube testing manual. So 60/ (min) 60 = 60% triode 1 13.8/32 PC 1.5 triode 2 12.3/32 PC 1.3 I mark all my tubes, so please dont waste your time seeking to send me back your old dead tubes. All testers read differently. I have sought to have my tester as accurate as possible. I will not be giving partial refunds because you have received different test result. All tubes will be shipped well, an example of how I pack is pictured in the listing. (obviously these tubes are not included) I wont be lying on a customs form I combine shipping. If the tubes are of significant value, the postage will be extra due to insurance.

Tested on a fully restored TV7-DU, by Dan Nelson, pictures of evidence for this included in the listing. It was restored and calibrated on October 21st 2021. Tubes are tested for shorts. PC= Plate Current DC= Date Code Please note, TV7 data minimum is equal to 60%. For example, (insert model number here) min value 60. If the tube tests at minimum 60, that is equal to 60%. The number over (/) is the minimum test data result as described in the TV7 DU tube testing manual. So 60/ (min) 60 = 60% tube 1 (without sticker) 57.5/32 PC= 6.3 50.3/32 PC= 5.5 DC= B6AS tube 2 45.8/32 PC= 4.9 50.3/32 PC= 5.5 DC= 161b1h2 I mark all my tubes, so please dont waste your time seeking to send me back your old dead tubes. All testers read differently. I have sought to have my tester as accurate as possible. I will not be giving partial refunds because you have received different test result. All tubes will be shipped well, an example of how I pack is pictured in the listing. (obviously these tubes are not included) I wont be lying on a customs form I combine shipping. If the tubes are of significant value, the postage will be extra due to insurance.

Tested on a fully restored TV7-DU, by Dan Nelson, pictures of evidence for this included in the listing. It was restored and calibrated on October 21st 2021. Tubes are tested for shorts. PC= Plate Current DC= Date Code Please note, TV7 data minimum is equal to 60%. For example, (insert model number here) min value 60. If the tube tests at minimum 60, that is equal to 60%. The number over (/) is the minimum test data result as described in the TV7 DU tube testing manual. So 60/ (min) 60 = 60% 56/32 PC= 6.1 58/32 PC= 6.3 I mark all my tubes, so please dont waste your time seeking to send me back your old dead tubes. All testers read differently. I have sought to have my tester as accurate as possible. I will not be giving partial refunds because you have received different test result. All tubes will be shipped well, an example of how I pack is pictured in the listing. (obviously these tubes are not included) I wont be lying on a customs form I combine shipping. If the tubes are of significant value, the postage will be extra due to insurance.

Two (2) 6BQ5 EL84 Curtis Mathes vintage vacuum tubes, made in Japan, all are grey ribbed plates, top O getter, tubes tests: 90, 90 % Price is for all tubes pictured. We test all tubes we sell! We will combine shipping! Check out my other tubes!Scale 1-100, good quality percentage on my Triplett starts at 54.

Raytheon JRP-5654. Also known as 6AK5W. RF amplifier pentode. It is also suitable for audio use as a direct plug in replacement for the 6J1 valve and gives far superior performance when used for this. Will be carefully protected and packed for delivery.

AUDIO RESEARCH SP8 VALVE PREAMPLIFIER This does power up but it emit’s a buzz through the speakers on both channels. I’m pretty sure the valve’s are in the wrong place as they don’t heat up. Also the chassis shorting pin is missing this won’t help with the buzzing. This did work a long time ago but has sat in storage for years now. Also the top lid is missing I have looked but can’t find it unfortunately. It’s in decent condition apart from what looks like glue on the front panel. Please see pictures for condition.

HAVING A CLEAR OUT NOW RETIRED MAY BE OF USE TO SOMEONE,THIS IS FOR A NEW UNUSED EL82, 6P18P, 6DY5, PENTODE, SUPER RUGGED AUDIO OUTPUT VALVE. TESTED. IN THE PAST I HAVE USED THESE MANY TIMES TO REPLACE EL84 VALVES IN DANSETTE AND SIMILAR RECORD PLAYERS, AND IN MANY DIFFERENT RADIOS WITH OUT ANY PROBLEMS, THE B9A BASE PIN OUT CONNECTIONS IS THE SAME AS THE EL84, SO NO ALTERATIONS TO THE VALVE HOLDER OR WIRING . IN SOME CASES YOU CAN INCREASE THE CATHODE RESISTOR TO 270 OHMS, TO REDUCE CURRENT. EL82 SPECS HEATER VOLTS = 6.3v HEATER AMPS = 0.8 ANODE/SCREEN VOLTS = 170v ANODE I/Ma = 53ma SCREEN I/Ma = 10 Ra K ohms = 20NEG GRID VOLTS = 10v ANODE LOAD = 4000 ohms POWER OUTPUT = 4 watts ALWAYS HAPPY TO COMBINE POSTAL COSTS.