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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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PostPosted: 28 Oct 2013, 11:24 
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Joined: 28 Oct 2013, 11:09
Posts: 1
Has anyone built this Direct-Coupled Audio Amplifier with Cathode Follower amp?
If so, where can I get the output transformer?
Were you happy with the performance?

This is a very interesting amplifier.

Thanks,
Mike


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PostPosted: 28 Oct 2013, 13:53 
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Joined: 28 May 2008, 21:53
Posts: 4577
Location: Winnipeg, CANADA
Hi Mike.

A neat looking design indeed. I have seen only a couple built - and just one channel at a time as it is hard to find a suitable output transformer . As noted, the choice of output transformer will be very important in this circuit. The article says 6k with a DC resistance of 250 ohms on the secondary. Look for a transformer with a primary of 5 to 6k, but you have to stay pretty close to a DCR of 250 ohms on the secondary.

Cheers

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PostPosted: 28 Oct 2013, 17:40 
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Joined: 04 Jun 2008, 20:59
Posts: 3960
Location: Arizona, USA
Hi I believe I would try this one from Edcor.

http://www.edcorusa.com/p/545/gxse5-8-5_5k

If the DCR is not high enough a fixed resistor could be put in series with the primary. It would waste a little output but not really make that much difference. You could if desired use a fairly large value capacitor across the resistor and that should restore nearly all the output.

Good listening
Bruce

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PostPosted: 13 May 2019, 15:22 
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Joined: 19 Oct 2018, 15:30
Posts: 101
Location: Montréal, Québec
Sorry to dig this out of the grave, but I have the same question : does anybody have built this amplifier ? I have a pile of 6SJ7, a pair of 5k SE OPT, and pretty much everything else that’s needed. I’m curious about the direct coupled topology.


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