6L6s and EL34s in a Nomad 100?

[jaquetapus]

I've heard that combining a pair of 6L6s and EL34s in the Mark IVs really brings them to life. Is it possible to do this in the Nomad, 6L6s on the inside and EL34s on the outside? What exactly would this do for the overall tone of the amp? I'm trying to reduce the flubbiness of the low end and make it sing a little more.

-dave

 

[fluff191]

Guys on this forum have done it with thier Rectos. Just leave it in 6L6 mode and the EL34's be be running very cold, but you wont hurt anything.

 

[nomad100hd]

u need: two 220? resistors, exacto blade, soldering iron, solder and some wire. Then cut the trace on the tube board that sends bias voltage to the outer tubes. Solder on um actually can't completely visualize the dual bias supply in my head yet sorry.

 

[Dolebludger]

I must confess that I don't understand the complaints about low end flubbiness on the Nomad. The low end on my 55 sings. My problem is I play a lot of music where the low strings are still ringing while I play higher notes. I wish those higher notes could be more clear and round. Any suggestions?

 

[nomad100hd]

look at the mod thread just remove the blasted PI load bypass caps!

 

[nomad100hd]

mine has never been flubby, just dull but not anymore.

 

[Monsta-Tone]

You might be able to get a quad of mixed tubes from Eurotubes.
The Mark IV is a Simul-Class amp and is set up to run EL-34's and 6L6's in a mixed setting. You will do serious damage to your amp if you are not careful. There is a lot more going on in the Mark IV than most people realize. Different Output Transformer taps for each pair, different Bias circuitry for each pair, etc.
Bob might be able to sellect 2 pairs of tubes that work really well together.

I think that you would be happier with a quad of KT-66's. They are expensive, but they sound incredible!
They have the thump of the 6L6 combined with the sparkle of an EL-34.

 

[Koreth]

You could try placing the amp in EL34 mode, and running a pair of 6L6GCs and EL34s. The lower bias voltage will warm the 6L6s up nicely, so it isn't running as cold. Be careful, however. In EL34 mode, the screens get 460V, 10 volts over what a 6L6GC is rated to handle.

 

[Monsta-Tone]

That might not be a bad idea.
I would definitely keep an eye on the amp though. Watch the tubes and make sure they don't start red-plating.


FWIW: I've got some Rivera Fenders that have around 560 plate volts. I'll have to check the screens, but they are much tougher tubes than most people think.