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World Audio Design KIT 6550 & KAT 6550 JJ Full Revalve Kit
https://www.watfordvalves.com/product_detail.asp?id=3552
World Audio Design Ampllfiers / World Audio Design KIT 6550 & KAT 6550 JJ Full Revalve Kit. World Audio Design is an excellent range of Audio amplifiers that come in kit or full made format. Many readers have enjoyed the huge improvements made to these fine W.A.D. kits simply by fitting specially selected valves.
Test Reviews - Watford Valves
https://watfordvalves.com/cgi-bin/documents/testreport_42.pdf
6550-EH/SOVTEK: The 6550 EH has been in the market place for a few years and comes in a very nice coke bottle type glass envelope. The bass response was well extended with musical detail and bass runs easily and accurately displayed. The valve also had a very large soundstage which made the sound sparkle and kick into life. The midrange was a little
Auris Audio Fortino 6550 integrated amplifier - Hi-Fi+
https://hifiplus.com/articles/auris-audio-fortino-6550-integrated-amplifier/
Vacuum tubes: 4 ×ECC82, 4×6550. Load impedance: 4 Ω and 8 Ω. Frequency response: 17 Hz–30 kHz (± 1,5 dB) Output power: 50 W. Input Impedance: 100 kΩ. Dimensions (W×D×H): mm 450 ×400 ×270. Weight (kg): 19.5. Price: £4,795. Manufacturer: Auris Audio URL: aurisaudio.rs. UK Distributor: Elite Audio Distribution. Tel: +44 (0)1334 570666
Rectifier Flashover WAD Kits 34, 6550, 2A3 - World-Designs ...
http://world-designs.co.uk/forum/showthread.php?t=3859
Rectifier Flashover WAD Kits 34, 6550, 2A3. Kit/Kat 34, Kit/Kat 6550 and 2A3PSE Rectifier Flashover - Fitting Balancing and Surge Resistors. Kit/Kat 34 and Kit/Kat 6550. Some owners have had problems with the valve rectifiers flashing over, usually at switch-on when surge is greatest. Being directly connected to the mains TX it would be ...
Tung-Sol 6550 – Upscale Audio
https://upscaleaudio.com/products/tung-sol-6550
Tung-Sol 6550. A current re-creation of the classic original 6550, now made in Russia. Super dependable, works well in most all applications. We burn them in for 72 hours, check for excessive current draw, all that good stuff, then match each tube in circuit at real voltages. We've been using these in a variety of amps here with fantastic results! Because of it's superb test …
PP2012 - KT88 Hi-End Push Pull Amplifier - Audio Design Guide
http://www.audiodesignguide.com/PP2011/PP2012.html
6550: KT88: Power max: 25W: 42W: 42W: Anode voltage max: 800V: 500V: 800V: Screen voltage max (G2) 400V: 440V: 600V: Cathode current max: 150mA: 190mA: 230mA: Internal resistance in triode conf. 1250ohm: 1000ohm: 1000ohm: Price medium each (euro) 15: 27: 30
DIY and Hi-Fi Audio Schematics - DIY AUDIO PROJECTS
https://diyaudioprojects.com/Schematics/
6550, KT88, KT90 - beam tetrode. SE 6550 Tube Mono Block Amplifier Schematic (12DW7 input) - [7 Watts, SE, class-A] - (Photographs) SE KT88 Tube Amplifier Schematic (6N1P input) - [5 Watts, SE, class-A, UL] - (Photographs) SE KT88 Tube Amplifier Schematic (12AX7 SRPP input) by Jean Hiraga - [6 Watts, SE, class-A]
Electro-Harmonix 6550 – Upscale Audio
https://upscaleaudio.com/products/electro-harmonix-6550
Electro-Harmonix 6550 This is a great tube. Again, we are very conservative, having seen the "hot new tube" being to too cool. These have been tested in real-world conditions and they have proven to be a great tube, so you can relax and get back to playing your Norman Greenbaum. Pricing above includes matching in any quantity you need at no extra charge. All power tubes are …
Audiogon Discussion Forum
https://forum.audiogon.com/discussions/best-modern-6550-tube-for-arc-per-amp
you do realize that the audio research ref 6 linestage uses its single 6550 tube as a voltage regulator in the power supply section, feeding the 4x 6h30p controlled gain section, right? this has been the case since the ref 2a model... where the power supply/regulation circuit incorporated a single 6550
World Audio Design
http://www.audiocircuit.com/DIY/Valve-Amplifiers/Material:Valve-Amplifier-Kits/World-Audio-Design
Advertisement. General information World Audio Design website (October 2001): Company ProfileWorld Audio Design was set up in response to reader demand for hi-fi kits from Hi-Fi World magazine. It was Hi-Fi World's DIY Supplement, launched in February 1993, that set the ball rolling, with features on loudspeaker and amplifier designs.Manufacturing is a lot different from …
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