Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Siemens EL34 on March 04, 2022, 09:25:31 am

Title: 12BH7 bias tube replacement with 12au7
Post by: Siemens EL34 on March 04, 2022, 09:25:31 am

Hey Guys..could you please advise me if I can substitute a 12BH7 with a 12AU7 in my Magnecord bias circuit? The attachment schematic is for the model P63 but mine a P70 has a 12BH7 ( the rest is pretty much identical). I am not sure why they used a different tube. Thanks for your help!

Title: Re: 12BH7 bias tube replacement with 12au7
Post by: sluckey on March 04, 2022, 10:00:25 am

I think so. I'd try it. Ain't gonna hurt anything.