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Chris
Jan 15, 2024
In PCBs and general enquiries
For the Dumble style amps, your schematics have R14 and R16 listed at 3W and 2W respectively. These values seem like way over spec'd to me. Assuming plate current for the 12AX7 should be about 4mA total, and the voltage drop (about 40V) would occur over R14, R16 and R17, none of these resistors should be dissipating more than 1/2 watt per resistor. So we should be able to use 1 watt resistors here. Am I missing something? Or is that just the way HAD did it?
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Chris
Dec 12, 2022
In PCBs and general enquiries
Is this board to be used for a stand alone box, or is it designed to be integrated into an existing amp? I ask only because I have not come across one of these before.
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Chris
Jan 31, 2022
In PCBs and general enquiries
Hi there. I have a lot of experience with building tube amps, but little experience with the Dumble world. I couldn't find much information on the Gen3 circuit. Do you have a brief summary of what the purported sonic differences are between the 102, 124, 183 and Gen3 are? I see that they are all very similar circuits (of course). My build will be "low" power, eg 2x6V6 or 2x5881. Regards from snowy Maryland. Chris.
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Chris

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