question about the bassman 135 circuit

[maryjane]

i'm seriously considering this amp.

it is called "ultralinear" and i don't know exactly what that means.

can someone tell me, in non tech terms, what that means?

i'm hoping it will work as a substitute, replacement, or back up for my TR.

are any of you experienced with it? any advice?

thanks (as always).

mj

[bunny 7]

Can't help with the definition of "ultra linear", but here's a link to information on it and there is a pdf schematic in the info on right side of page.

http://ampwares.com/amplifiers/fender-super-bassman/

Maybe someone else will be able to explain your question better.

[backline]

Was one way of getting more, "clean" power and feeding B+ to the screens.
A lot of people do not feel that they are Fender's prettiest sounding amps, and others love them of course. You will know when you try the amp.
Do you use that much power/head-room.?
If the electronics died in your Twin, you could plug the Bassman into your Twin speakers. Would be a convenient back-up amp.....as you say.
best

[printer2]

Ultralinear operation is where the power tube screens are connected to a tap on the output transformer rather than to the power supply. The tubes operate in between how a pentode operates and how a triode operates. Triodes generally have less distortion compared to a pentode and ultralinear gives you the power of a pentode but the lower distortion of a triode. So generally it is a cleaner amp.

[maryjane]

thanks for the help, boys..i'm really looking for a twin reverb in a head but much lighter

[Kennedycaster]

Originally Posted by maryjane

thanks for the help, boys..i'm really looking for a twin reverb in a head but much lighter

How about a Showman or a dual Showman reverb head? They're basically twins in head form except the Showman does not have reverb.

Bob

[Ringo]

FWIW the 135 watt Bassman should be pretty similar to the 135 watt Twin Reverb of the same era , it's the same chassis, and I'd bet a lot of the circuit is the same, obviously the Bassman won't have reverb or tremolo.

If you are just looking for loud and clean that amp will do it.

[maryjane]

yep, i'm looking into those as well, thanks.

[jh45gun]

If you come across a PA 100 head I would not pass on that either.

[maryjane]

what type of circuit is the p.a. 100?

[sacrificetravis]

I believe its loosely based on a twin. Not 100% sure but I'm sure someone will correct me

[jh45gun]

Originally Posted by maryjane

what type of circuit is the p.a. 100?

It basically is a Twin or Dual Showman Reverb only in a 4 channel PA format instead of a two channel amp. Each Channel has Volume Bass and Treble and the volume pot if you pull it out activates the reverb for that channel. There is also a master volume and the Reverb master volume knob. Of course being a PA has no tremolo. The amp has the same Transformers as the Twin and Dual Showman amps the same tubes except for the Tremolo and the same filter cap layouts. It makes a good amp and in the Vintage Guitar and amp guide is the only PA head that is listed as a amp head. For all intents and purposes it is a 100 watt Twin or Dual Showman head. Only thing is the input is wired for Microphones so changing the input to a twin or showman type input by changing a resistor or cap maybe values will do it. You do not need to but it is not as loud otherwise but a easy fix if you do not want to mod the amp is use a EQ pedal in front of the input. This boosts your guitar signal and makes the amp sound like it should volume wise. A easy fix plus it gives you more flexibility with tone shaping.

[maryjane]

that sounds totally cool.....bet they're kinda heavy too, no?