Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TIMBO on December 10, 2014, 01:12:24 pm

Title: Using spare pins on power tube sockets
Post by: TIMBO on December 10, 2014, 01:12:24 pm

Hi guys, I know it is the norm to use pin6 on power tube socket for a handy placement of the screen resistor, but what about using pin1 as a connection for the grid resistor.
This is how the Holden Wasp is done, good/bad idea?? Thanks

Title: Re: Using spare pins on power tube sockets
Post by: SILVERGUN on December 10, 2014, 01:31:39 pm

Yup,,,
This is from sluckey's TDR

Title: Re: Using spare pins on power tube sockets
Post by: alerich on December 10, 2014, 01:34:24 pm

You can use pin 1 or any other unused pin as a connection point. Just be aware that certain tube types use pin 1 while others do not.

Title: Re: Using spare pins on power tube sockets
Post by: SILVERGUN on December 10, 2014, 01:42:44 pm

Quote from: alerich on December 10, 2014, 01:34:24 pm

Just be aware that certain tube types use pin 1 while others do not.

Yeah,,, don't wire it like that if you ever want to switch to EL34's

Title: Re: Using spare pins on power tube sockets
Post by: TIMBO on December 10, 2014, 02:04:04 pm

Thanks guys, That what I was thinking with the el34.

Title: Re: Using spare pins on power tube sockets
Post by: sluckey on December 10, 2014, 03:44:12 pm

Quote

This is from sluckey's TDR

And I borrowed that idea from Fender.  :wink:

Title: Re: Using spare pins on power tube sockets
Post by: TIMBO on December 11, 2014, 01:40:34 am

Thanks guys,I'll remove the grid resistor from pin1 and use pin6 to hold the end. Connect pin 1&8 to the 1ohm bias resistor as I have done in most of my builds.  :icon_biggrin: