Where are people biasing their output tubes
Ive got 435v on the plates of my TAD STR 6L6GCs and wondered how hot my tubes should be running ?
Havent fited 1ohm cathide resistors yet - just wondering.
Thanks
Pete
Sorry - more questions !! Biasing ??
Moderators: pompeiisneaks, Colossal
Re: Sorry - more questions !! Biasing ??
Around 35ma +/-3 is usually good. Judge by ear once you're in that ballpark.
Re: Sorry - more questions !! Biasing ??
thanks for the tip mlp
have a good week
Pete
have a good week
Pete
Re: Sorry - more questions !! Biasing ??
jsut fitted cathode power resistors both measured 1.2ohms - getting 40mv so reckon I'm already at 33ma per tube or so.
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Re: Sorry - more questions !! Biasing ??
pedro wrote:Where are people biasing their output tubes
Ive got 435v on the plates of my TAD STR 6L6GCs and wondered how hot my tubes should be running ?
Havent fited 1ohm cathide resistors yet - just wondering.
Thanks
Pete
Last edited by groovtubin on Tue Apr 25, 2006 5:36 pm, edited 1 time in total.
Re: Sorry - more questions !! Biasing ??
Wait a minute...
70% of 25W is 17.5 W.
17.5W / 460V (about what you might see in an ODS) = about 38 mA max bias current.
Let your ears tell you what's right, but use that number as a safe upper limit. Depends what kind of 6L6 you have in there too.
70% of 25W is 17.5 W.
17.5W / 460V (about what you might see in an ODS) = about 38 mA max bias current.
Let your ears tell you what's right, but use that number as a safe upper limit. Depends what kind of 6L6 you have in there too.
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Re: Sorry - more questions !! Biasing ??
thanks macman!! did that off top of my head, sorry guys!!oldmacman wrote:Wait a minute...
70% of 25W is 17.5 W.
17.5W / 460V (about what you might see in an ODS) = about 38 mA max bias current.
Let your ears tell you what's right, but use that number as a safe upper limit. Depends what kind of 6L6 you have in there too.
jim
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Re: Sorry - more questions !! Biasing ??
A 6L6 is a 30W tube Fellas
Owner/Solder Jockey Bludotone Amp Works