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Mini-amp for Output Tube Distortion
Mini-amp for Output Tube Distortion
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Old 4th September 2018, 05:20 PM   #1
Printer2 is offline Printer2  Canada
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Default Mini-amp for Output Tube Distortion

We have had a few threads where the OP's were interested in output tube distortion, one asked it to go to a pedal. So how about a pair of 6AK6's driven by a 12AX7? Using a 12V laptop supply which supplies the heaters and a step up module for the high voltage. The speaker can just be a resistor and a pot used to send the signal to the next device. Should have no preamp distortion. Or maybe should go Paraphase? Hmmm...

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Old 4th September 2018, 05:41 PM   #2
Thomasha is offline Thomasha
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Looks good!
And the 6ak6 has the highest output power/ filament current I know!
Only 150mA for 1 W!

This one would probably have almost 2W. Would you mic it or use the signal at the speaker and reduce it to line levels?
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Old 4th September 2018, 05:46 PM   #3
Printer2 is offline Printer2  Canada
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I was thinking of doing the line level, pick a good load value that will give you the distortion characteristic you want.
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Old 4th September 2018, 06:06 PM   #4
22uf is offline 22uf  United Kingdom
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So the idea here is to have power amp distortion in a pedal? How is this possible with only 12v? Iíve seen 12ax7 pedals but they are at low voltage and donít make use of the tube properly due to the low voltage?
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Old 4th September 2018, 07:21 PM   #5
Printer2 is offline Printer2  Canada
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DC-DC 8~32V To 45~390V High Voltage Boost Converter ZVS Step-up Booster Module 699993580165 | eBay
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Old 4th September 2018, 07:37 PM   #6
22uf is offline 22uf  United Kingdom
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Ah right of course. Great idea
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Old 4th September 2018, 09:27 PM   #7
mozz is offline mozz  United States
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Is this any different than a Herzog? What about using one of those voice coils dummy loads Weber used to sell?
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Old 4th September 2018, 11:02 PM   #8
Printer2 is offline Printer2  Canada
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A Herzog is a Champ, I suggested an AC-4 but the amp is single ended. This is Class AB push-pull, the only question mark is the output transformer. I have a few suitable ones but they are not readily available. I have some 70V transformers I may try. Will it be enough gain? May need a FET up front to warm up the signal, or another pedal. I just wanted to put together the simplest circuit that may be up to the job. Could go two Self-Split if more gain is needed, I hope not.
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Old 4th September 2018, 11:42 PM   #9
mozz is offline mozz  United States
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You can get a PP 10k transformer for $16 with multiple primary and secondary taps.
Spec sheets are saying 10% distortion in class a SE. I think that might be better. You would have a second triode for gain if needed.
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Old 5th September 2018, 12:13 AM   #10
Printer2 is offline Printer2  Canada
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Not where I live.
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