Guitar amp with 6P6S (6V6) and probably 12AX7 - Page 2 - diyAudio
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Old 29th December 2012, 03:20 AM   #11
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That one looks like a perfectly reasonable design and easy to get right, for a first project. Plus the parts are easy and cheap to source.

Single ended topologies will work fine for the posters stated use. It is just for a practice amp and for fun. So have fun.
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Old 29th December 2012, 04:44 PM   #12
maton00 is offline maton00  Mexico
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the only one impractical thing it's that you will have a little trouble with the gains ,but you said that you are going to make a tone control? if that's true you shouldn't have any problem.
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Old 29th December 2012, 06:15 PM   #13
kevinkr is offline kevinkr  United States
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Since this is a guitar amplifier thread I'm going to move it to the instruments & amplifier forum where it belongs.. That said welcome to diyAudio!
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Old 31st December 2012, 12:11 AM   #14
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I would think a 1.5K resistor on the input cathode and that a mid control is not too much value on a low power amp. But if you got the pot anyway, why not.
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Old 31st December 2012, 01:15 AM   #15
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by maton00 View Post
c'mon......

what transformers do you have ,or what are in your possibilities?
I´ve done this one and I have no complains.
and it´s very simple.
You've not really connected B+ to the center tap on this transformer have you? In this configuration an 8 ohm load is only reflecting 1/4 of the total primary impedance to the 6V6.. (Also only 1/4 of the primary inductance)

I have no clue if this transformer has a 20K primary as would be implied by the 5K + 5K shown in your schematic (unlikely) more likely it is a 10K primary in which case the impedance reflected to the plate of the 6V6 will be about 2.5K which is a bit low for good performance. A proper gapped 5K SE output transformer would probably provide better performance.

There is a second triode available for use with your current tube line up, should not be too hard to get the additional required gain across two stages.
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Old 31st December 2012, 07:24 PM   #16
maton00 is offline maton00  Mexico
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its a 10k push pull transformer using only a half of it ,just in case of not having a 5k SE opt.
the other half of the 6sn7 can be used for more gain, or in case of the need of another SE module if you dont want to miss use it (a 6sn7) you can also put in the same circuit a 12au7 or a 6n1p or a 6j5 leaving all without changes.

Last edited by maton00; 31st December 2012 at 07:29 PM.
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Old 31st December 2012, 07:48 PM   #17
kevinkr is offline kevinkr  United States
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One half of a 10K primary is not 5K but 2.5K as the impedance ratio scales as the square root of the turns ratio which is 1/2 so the impedance is 1/4 or 2.5K.. IMO you can expect better performance with a real 5K SE transformer as I previously noted.
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Old 31st December 2012, 11:05 PM   #18
maton00 is offline maton00  Mexico
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This is what i meant to say:
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