Sunn Musical Equipment > Q & A

Sunn 200s running on 6L6 tubes?!

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Pacafeliz:
Hey folks, nice to be back after many years of absence!
I'm back here in Mexico and happened to pick up an old 200s, and it's working. But i did realize it has a pair of 6L6 tubes instead of KT88s - that can't be right, right? The rectifier is a 5U4.
Original owner says he's been running it like that for the last 20-30 years!
The outputs on the back are not marked what impedance they take, so i guess it's 8 and 4, right?
So my brother has a big Fender Dual Showman cab here, which should be 4 ohms, so I connected that one.
No nasty noises, good sound, but one of the power tubes was massively redplating,  so i shut it off.
Will take it back to Germany with me and get some KT88 first,  then have my tech guy check it out.

Any thoughts?

Cheers,
Pat.

Pacafeliz:
Here it is:







subir imagen gratis

loudthud:
Those tubes are OK if that's all you can get, but output power is probably only 45 to 50 Watts. Probably needs to be checked out by a good tech.

Note: A 4 Ohm cabinet should be plugged into the "External Speaker" jack. The internal wiring should be checked to see if the amp is wired for 4 or 8 Ohm cabinets or 8 and 16 Ohm cabinets. There are pictures on this web site to check.

Link: https://forum.sunnstillshines.online/index.php?topic=4844.msg18880#msg18880

Pacafeliz:

--- Quote from: loudthud on April 08, 2024, 03:16:02 pm ---Those tubes are OK if that's all you can get, but output power is probably only 45 to 50 Watts. Probably needs to be checked out by a good tech.

Note: A 4 Ohm cabinet should be plugged into the "External Speaker" jack. The internal wiring should be checked to see if the amp is wired for 4 or 8 Ohm cabinets or 8 and 16 Ohm cabinets. There are pictures on this web site to check.

Link: https://forum.sunnstillshines.online/index.php?topic=4844.msg18880#msg18880

--- End quote ---

Oh wow, thanks man, that's great info!
I'll open the amp up and check (take pics) next weekend.
In the meantime I've ordered some KT88s.
I'll also try to get the correct rectifier tube, since this one's wrong, too.

Stay tuned!

PS: any idea on its age/year, by looking at the pics?

loudthud:
For an amp this old, there might be other issues that pop up. Read through this thread over on the MEF board.

Link: https://music-electronics-forum.com/forum/amplification/guitar-amps/sunn/994060-200s-sunn

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