Tube Amp Archive

I think the 5% regulation exhibited by the 2.7A load is a reasonable / typical full load characteristic, so I’d be happy to use it for such a project. The 2ohm winding resistance seems higher than expected though; did you calibrate the meter first, so that shorting the probes resulted in a reading ...

Hi all, I'm planning on building a guitar amp based on Rob Robinette's simplified AB763 circuit he calls the "Blackvibe". I want to use the power and output transformers I salvaged from a Roland Bolt 60. Trouble is, the Blackvibe circuit draws approximately 2.4A at 6.3v for the heaters while the pow...