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DucRyder
03-25-2009, 05:40 PM
I'm considering installing (2) 6V6 tubes in my Blockhead JTM 50 copy. It uses a gz34 recto. Is this gonna work?
DucRyder
03-25-2009, 05:41 PM
300V on the plates of EL34s currently.
QRSS
03-25-2009, 06:07 PM
my guess is yes, provided you can bias it in range. maybe check with builder first.
BCJek
03-25-2009, 06:14 PM
If you go with JJ 6V6's, it is an absolute certainty, in terms of the plate voltage. They handle 450+ in my stuff with nary a whimper. That even gives you some latitude in terms of alternate rectifiers tubes.

Michael
jcs
03-25-2009, 06:18 PM
man thats some low plate volts?

thats the range of my 63 tremolux with a gz34,actually mine is about 325 range.

i'm curious, what are you trying to achieve with 6v6 tubes?
DucRyder
03-25-2009, 08:16 PM
man thats some low plate volts?

thats the range of my 63 tremolux with a gz34,actually mine is about 325 range.

i'm curious, what are you trying to achieve with 6v6 tubes?
same volume with the power tubes working a bit more into the picture. I like how ragged a 6V6 sounds when working a bit.
DucRyder
03-25-2009, 08:17 PM
If you go with JJ 6V6's, it is an absolute certainty, in terms of the plate voltage. They handle 450+ in my stuff with nary a whimper. That even gives you some latitude in terms of alternate rectifiers tubes.

Michael
what effect would different rectos have on the tone in your experience?
GearHeadFred
03-25-2009, 08:22 PM
You should be fine -- be sure to check the bias, though... And it is a good idea to check with the builder, because there is a slight pin out variance that CAN cause problems in amps not wired for tube swapping (usually safe when going from EL34 -> 6x6, but not always the other way around)

Generally, the higher the plate voltage, the more clean headroom... which I think is the opposite of what you trying to achieve.

I'm not a Marshall expert - but I believe many of them run low plate voltage. A 5U4 recto would lower the voltage even more
BCJek
03-25-2009, 08:28 PM
Not so much a tonal change with recto changes, but diff. rectifier tubes will give you diff. B+ voltages via voltage drop. B+ voltage effects "feel" as much as tone, in my opinion, and may give you more or less clean headroom.
DucRyder
03-26-2009, 03:15 PM
Thanks for the tips! This amp has a low voltage tranny that puts around out 300V with EL34 and the GZ34 in place.