Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: fossilshark on August 21, 2023, 09:05:41 am
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Hi all, I want to build myself a rackmount power amp unit since I've been building alot of preamps lately. I am thinking I want to make it 50w EL34/6L6 using the mesa boogie dual rectifier power amp circuit.
I am just wondering how I would go about with the input section, would anyone recommend maybe a 12ax7 buffer input to go before the phase inverter? Or would I be fine just making the input jack go straight to the phase inverter. The input is only ever going to see line level signal anyways.
Anyone have any recommendations for features/input sections for a standalone power amp like this?
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You don't need a buffer on the power amp input. Any buffer would be put on the output of the preamp and only if you will have a long cable connecting the preamp to the power amp. If only using a foot long patch cable no buffer should be required.
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I built one one time and I put an AB763 reverb circuit right before the phase inverter. No buffer before that though. Worked really well. I lost interest in it after a while and some guy couldn't live without it, so it's gone.
Dave
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I am thinking I want to make it 50w EL34/6L6 using the mesa boogie dual rectifier power amp circuit.
Show us a schematic! I can't find a 50W dual rectifier circuit.
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+1 vote for yes input triode.
If you ever want to hit the amp with a cool stompbox, no preamp needed.
https://el34world.com/charts/Schematics/files/Mesa_boogie/Boogie_20_20_poweramp.pdf