stromberg carlson signet 33 ceriatone 5x3

I took a signet 33 and removed the insides and replaced with a ceriatone 5x3 point to point turret board. Its a 1959 fender tweed deluxe with bigger transformers and a few changes so that it can handle using two 6l6gc power tubes for 33 watts instead of two 6v6gt tubes for 12 watts. It turned out really well.

Category:

Entertainment

Tags:

• stromberg
• carlson
• signet
• 33
• ceriatone
• 5x3

[btmybrother]

the amp is not nearly as clean as it sounds. my volumes were on 9 o' clock at the most. by 12 o' clock its fairly crunchy. its a really good sound though. especially for blues or with a pedal in front. if i put a 12y7 in the first tube and a 12at7 for the phase inverter it would really clean up a lot. i like the 12ax7's though. they just have a richer sound to me. i know they aren't as clean, but i would rather have a good sound than a clean sound.

[btmybrother]

well, I am a certified electronics technician. if you don't KNOW electronics then i would not mess with a tube amp. lately I've started rebuilding old circuits, but this was my first conversion so i needed something to get my feet wet. i bought a complete circuit board from ceriatone (5x3 - big deluxe)

i hooked it up and tested the bias. it was too high so I changed the cathode bias resistor to a larger value. i tied the two inputs together, so one volume is normal and the other is bright.

[RanCiDka]

Also what kind of speakers did you use here

[btmybrother]

@RanCiDka 12 inch rola alnico's from a hammond pr20 tone cabinet @ 1958

[RanCiDka]

What kind of transformers did you use

[btmybrother]

@RanCiDka stock from the stromberg

[MrAnders1976]

anyways ,, great sound and great playing :-)

[MrAnders1976]

You could probably get 33 watts ,, but then be biasing the amp colder ,, but cathode bias amps drops further towards class B when pushed and then the amp would sound nasty when puhsed. That is why you bias them hot at idle.. 90% discipation.



[MrAnders1976]

hhmmmm 33 watt out of a cathodyne PI, cathode biased 6l6 amp, not very likely..

Beam tetrodes like 6v6, 6l6 are not very efficient in cathode bias operation in relation to pentodes (el84, 7951S, el34). MAtchless pushes 35 watt out of a pair of EL34 with giganttic transformers. Carr rambler squezes 28 watt out of a pair of 6l6. Tungsten buckwheat claims a full 30 watt clean out of a pair of 6l6 with oversized mercury transformers. What plate voltage do you have ?? cathode bias resistor value ??

[TheLeandrobrasil]

clean the amplifier exceeds a battery?

[cefdhefnSAE]

hey, nice video.. smooth playing too BTW.. that amp is a great one! I have an almost stock Stromberg Carlson 33.. (added three prong cord) but I don't have the cover as yours does though. I am curious if you find that it cuts some noise? I mounted my amp in a special built single 12 cab with a Ted Weber AlNiCo.

You can hear it in my video "All That's Left" .. and see it at the beginning of my quick studio tour video. Check it out!

[justthebassplayer]

Dude, you look just like Seth Rogan! Knocked-Up!

[TwoTones]

Crazy, I play through a Signet 33 too, although I think mine's pretty stock (it's been modded to accept 1/4" inputs, not sure what else was changed). Sounds like you have way more headroom on yours, I run mine at 10 or 11 o clock and it's pretty dirty.

How difficult was this conversion? Do you have more info about the changes you made to the 5e3 circuit?

Also, what's the difference between the two Volume knobs? The sound like they're operating on the same channel, is one a master?