Tube Amps / Music Electronics
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|12/23/2005 4:06 PM|
||Epi Galaxy 10 w/KT66?|
I got an Epi Galaxy 10 last week - great deal from MF. I put a Mullard 12ax7 and a CBS 6L6GC out of an old Bogen I have and WoW - what an improvement I happened on a pair of NOS KT66's with straight bottles and after reading about these on the net I installed one. An even bigger, fatter sound & boy was I loving it till the amp started to hum loudly so I shut it off. In the morning I turned it on standby and when I applied power the fuse blew. I put the 6L6 back in and a new fuse and it's fine. Does anyone know how these amps are bias'd? Do the KT66's need a bigger power tranny? I'd really love to run this tube in it the tone is killer!!! Any help will be appreciated.
|12/24/2005 5:15 AM|
The KT66s do take more filamentcurrent (1.27A - 1.5A from top of my head) than 6L6s (0.9A).
If the biasing and screengrid-circuit are ok then I do suspect the PT for having not enough power to feed the KT66-filament.
If this is the case (be sure to try the KT66 in another amp) then you could install an extra OT giving 6.3Vols at 3A.
Hope this helps/merry Xmas tweaks,
|12/24/2005 7:17 AM|
||oops, did mean PT not OT!|
|12/25/2005 9:51 AM|
||Re: Epi Galaxy 10 w/KT66?|
I've never heard of a straight bottle KT66,but have heard of and seen old Russian 6l6(sort of) straight bottles relabeled as "KT66" and "made in England" they were not the same as a 6l6gc or a true KT66 and this could possibly have caused your problem.
This amp is most likely cathode biased and set up for a normal 6l6gc.
just my 2 cents worth.
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