Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: cusebassman on March 23, 2019, 10:50:46 am

Title: Plate and Screen grid Voltage Verification
Post by: cusebassman on March 23, 2019, 10:50:46 am

Hey all. I'm using some National Union 6V6GTs from the 50s, and my stereo 5F2A build has 357V at plate and 311V at screen grid. 6V6GT spec sheets from the time quote max plate voltage of 315V and max screen grid voltage of 285V. Am I too far out of spec, in terms of shortening tube life?

Title: Re: Plate and Screen grid Voltage Verification
Post by: Colas LeGrippa on March 23, 2019, 11:07:11 am

Hi, look at the TOPHAT club deluxe schem.
Plate = 344V screen= 333V


Look at Fender deluxe reverb as well.....


The tube charts are a general guide and there are differences between charts sometimes

Title: Re: Plate and Screen grid Voltage Verification
Post by: Colas LeGrippa on March 23, 2019, 11:10:19 am

....you can easily run a pair of 6V6 at 350V without problem, I swear to G........
.......Ginette, my wife and my god.


There are experts here who'll explain you why.


Colas