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6l6gc or KT66
Posted:
Sat Jan 21, 2012 5:41 amby justinsweber
I was reading that a Kt66 can be swapped in for a 6L6GC is this true?
I do not currently have pin1 and pin8 jumpered.
Thank you
Posted:
Sat Jan 21, 2012 6:01 amby Shannon Parks
That would be fine.
Shannon
Posted:
Sat Jan 21, 2012 6:04 amby justinsweber
any thoughts on the KT66 vs 6l6GC?
Slightly more power or a wash? Has anyone run a KT66... Does it stress the power transformer the way the EL34 does? Or undue stress on the KT66 grids/ plates?
Thanx for all the help.
The amp has become the mainstay of my office rig.
Posted:
Sat Jan 21, 2012 10:28 amby battradio
The KT-66 is the Britsh equivelent of the 6L6G , no changes nesaccary .They sound is different but its a mater of taste .Though the KT-66 is a true pentode and the 6L6 is not , RCA coppied the KT-66 when they made the beam power tube (6L6G)Back in 1937
Posted:
Sat Jan 21, 2012 12:54 pmby Ty_Bower
battradio wrote:Though the KT-66 is a true pentode...
I thought the "KT" stood for "kinkless tetrode", and the anodes have big holes in the sides through which it appears there are beam formers. Are you certain the KT-66 is a "true" pentode?
Posted:
Sat Jan 21, 2012 1:12 pmby battradio
I may have the EL 34 and the KT 66 switched , but RCA coppied the KT 66 when they made the 6L6G
Posted:
Sat Jan 21, 2012 6:17 pmby Geek
EL34 == true pentode
KT*, 6L6* == beam power tubes (to avoid paying for/butting heads with the pentode patent as the story goes)
Cheers!
KT77 vs EL34 and use of Edcor XPWR005-120
Posted:
Sat Jan 21, 2012 7:55 pmby justinsweber
I have a Chuby CLem built and am going to do the mod to add use of EL34s.
I read somewhere in another post that the EL34s may be pushing the max of the output transformer... is this true? As a KT77 draws less current... would they be a better choice?
Long story short, Id like to run the EH 6CA7... love the construction. I used them in my ST70 was was amazed by the sound. But if the Power transformer will be stressed.. then Ill pass. Additionally... what power increases are to be had. SE 6CA7 5k transformer, triode/ no feedback.
I believe I was getting 3 watts with the 6L6GC STRs
Posted:
Sun Jan 22, 2012 6:02 amby Shannon Parks
You leave the same cathode resistors in place for *all* the tubes, so no re-biasing or output tranny worries is necessary.
Shannon
Posted:
Mon Jan 23, 2012 12:37 amby justinsweber
I guess the question was more about current draw and the power transformers ability to handle. Is running EL34s/KT77 ok with the spec'd power transformer?
Posted:
Mon Jan 23, 2012 12:11 pmby battradio
What the cuurent rating of the of the 6.3 volt winding , if your not over the rating by 25% don't worry .
The EL37 is the true pentode version of the of the 6L6G
The 6CA7 is the tetroed version of the EL34 .
Personly i prefer the sound of the 6CA7 and the 5881's