Marshall El34/100 Power Amp (pulling 2 Tubes)

ceremony5150

Member
Joined
Nov 11, 2009
Messages
75
Reaction score
5
Looking to reduce headroom in my EL34/100 Power Amp.

Can I pull 2 tubes and reduce the wattage 2 50 watts?
 

Dogs of Doom

~~~ Moderator ~~~
Staff Member
Joined
Aug 2, 2012
Messages
27,822
Reaction score
39,232
Location
Los Angeles
yes, but your impedance on the rear changes...

you'll only be able to use 16 ohm speakers (w/ the 8 ohm out).

8 ohm out = 16 ohm speaker
16 ohm out = 32 ohm speaker

Unless you rewire your cab's to be series (32 ohm 16x4), you can only use 1- 16 ohm cab per side.
 

mulletmule

Active Member
Joined
Nov 19, 2013
Messages
336
Reaction score
217
Location
Rochester NY
i have a friend who does that with his 800. A tech told him to do it but not sure about the impedance but makes sense I guess.
 

Jr Deluxe

Well-Known Member
Joined
Sep 12, 2017
Messages
274
Reaction score
277
I tried that once. It was still just as loud. The headroom was about the same. I think the tone lost some body and was a little less 3d. After a few hours i went back to 4 tubes. Did i get an instant 2204 from my 2203? Not even close.
 

RickyLee

Well-Known Member
VIP Member
Joined
May 22, 2010
Messages
10,242
Reaction score
3,673
Location
SoCal U.S.A.
I was thinking the same thing.

I used a Carvin Tube 100 stereo power amp with my all tube Carvin Quad-X preamp as my main gigging rig for well over 10 years. That was a sweet setup. That poweramp was stereo, an input on each channel and each channel was essentially a 50W amp with its own volume control. Each side had its own output transformer in push pull - two power tubes each side.

So I am thinking if his was stereo he would just turn the volume down on one side. Maybe that is why we have not heard back. On my Carvin, if you pulled two tubes it would;d have to be on one side which would essentially just be shutting that side down.
 


Top