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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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It is currently 27 Oct 2020, 13:19

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 Post subject: Re: 6V6 PP amp
PostPosted: 30 Mar 2020, 06:45 
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Joined: 01 Jun 2013, 09:05
Posts: 985
invaderzim wrote:
Thank you for the detailed tips M. Gregg.

I got it working, and it sounds better on speakers that weren't blown by the squealing sound. It still seems a bit low on power based on the estimated 10 watts that was shown as it is quieter than my SE 6L6GC amp but it does sound quite nice and is more compact.


I always run an amp up with either a couple of 8/10 ohm power resistors in place of the speakers.
Then if its all ok power up with some old car stereo speakers as a test, never test with hifi/expensive speakers the tweeter is normally the first casualty then the midrange.

Regards
M. Gregg

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 Post subject: Re: 6V6 PP amp
PostPosted: 30 Mar 2020, 10:06 
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Joined: 06 Oct 2015, 22:05
Posts: 41
Fortunately, these were cheap speakers that I only use for testing but I like the resistor idea and will replace these with super cheap loose speakers for the initial tests.


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 Post subject: Re: 6V6 PP amp
PostPosted: 31 Mar 2020, 11:49 
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Joined: 06 Oct 2015, 22:05
Posts: 41
I initially built the amp with the 470 uf and .22 uf capacitors mentioned in this thread. With my speakers and listening area it was way too much bass with that. I swapped them for the original values in the schematic and love the way the amp sounds.

It isn't quite as open and airy sounding as my SE amp but it has a surprising amount of force behind the music. I really enjoy the tone from the 6V6GT tubes in this.

I found myself already contemplating a bigger push pull build for my main system and am a bit tempted to see about doing a similar one to this with 6L6GC tubes but not sure what that would do overall to the tone and what would be involved. I've also thought about doing an ST70 but I'd prefer a more tradional layout with connectors on the back and power switch with volume control on the front.

Thanks again to everyone for the help.


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