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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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 Post subject: V-FET Amp replacement
PostPosted: 23 Oct 2017, 02:43 
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Joined: 23 Oct 2017, 02:31
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I have a 100watt V-FET Sony amp I use in a bi-amp configuration for my mid to hi freq. I use a SANSUI BA-5000 just for the low end. Beautiful system with many awards to date. What would you suggest as a replacement for the Sony V-FET Amp? The system is so crystal clear from 20-20k..I was thinking maybe a high output tube amp of some configuration. I would be particularly interested in the DIY approach if possible? Thank you in advance for your help. John Monsees


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PostPosted: 23 Oct 2017, 14:46 
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Joined: 02 Mar 2009, 12:41
Posts: 1068
Location: Vänersborg, Sweden
How about 6L6? :idea:

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“If you don't know where you are going, any road will get you there.”
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PostPosted: 23 Oct 2017, 16:46 
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Joined: 08 Aug 2009, 03:11
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Location: Chilliwack, BC
6L6GC as Magnus said, or EL34 something or other.

Are those V-FET's the same as in a Yamaha B-1? Want to sell it?
If so, I have a customer willing to pay serious $ for it to get his Yamaha going again.

Cheers!

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* Ratings are for transistors - tubes have guidelines*
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PostPosted: 24 Oct 2017, 08:19 
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Joined: 23 Oct 2017, 02:31
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I will check on the V-FET's similarity to the Yamaha B-1. Concerning the 6L6GC (per Magnus suggestion, is there a DIY kit out there for it or do I need to start white-boarding it? Thank you very much Gentlemen for the suggestions and quick responses.


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PostPosted: 24 Oct 2017, 11:55 
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Joined: 02 Mar 2009, 12:41
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Location: Vänersborg, Sweden
I was joking as I guessed that V-FETs aren`t really tubeamps ....

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“If you don't know where you are going, any road will get you there.”
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PostPosted: 24 Oct 2017, 12:09 
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Joined: 30 Aug 2017, 09:49
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A good KT88 amp will get a good clean clear 100 watts. I use 813's at 150 watts. That being said 813's are not for newness do to over 1200 volts. Ouch!

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PostPosted: 24 Oct 2017, 19:13 
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Joined: 23 Oct 2017, 02:31
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I had just found the KT88 in one of my old tube references. The voltage and what that means to work with it does not overly scare me. I have spent the last 40+ years working with Electron Beam Welders! Potentials in the tube tank and associated circuitry easily runs over 180,000 volts with additional bias voltages to complex things... We never see accidents with this equipment, only fatalities or permanent physical damage.


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PostPosted: 27 Oct 2017, 07:11 
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Joined: 18 Aug 2015, 07:38
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The V-fet is an exceptional amplifier from everything I have heard. You have a gem. I have multiple amplifiers both tube and SS. For a different sound I would recommend a single ended tube amplifier possibly an El34 or 6L6 circuit. Many designs out there both here and on the net if you can work from a schematic. I have a Nelson Pass designed V-fet amplifier I built. Outstanding sounding in a push pull amplifier but I also enjoy the difference in the many single ended tube amplifiers I have built as well.


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