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Post subject: Re: Fender Twin Reverb 135W Silverface
Posted: Wed Nov 21, 2018 9:42 am
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Do one or the other. That is the right classictone.
The cathode caps cancel bass at the preamp. Its kind of a patch.
But the original and reissue twin ot is much lower inductance than the ultralinear. Low inductance causes bass cancellation and distortion that is part of the vintage tone.
The iron core size and material dictates inductance and the amount of magnetic energy that the core can hold. It reaches its capacity at low frequencies first. This saturation limits the low frequencies to 25% of rated power. The distortion that the saturation causes is similar to sag at high frequencies, a pitch bending effect.
While a stock Fender ot runs about 9 Henrys, the Ultralinear is almost 20.
It will take an experienced tech to accomplish it. The cost of the tranny will turn it from a hi-fi power stage from CBS into the musical instrument Leo designed.


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Post subject: Re: Fender Twin Reverb 135W Silverface
Posted: Thu Nov 22, 2018 12:32 pm
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TimsAudio wrote:
The cost of the tranny will turn it from a hi-fi power stage from CBS into the musical instrument Leo designed.


Leo Fender had absolutely NOTHING to do with this amplifier. It (and all of the other ultra-linear platforms of the era) was the brainchild Ed Jahns who designed it to the specs as mandated by FMI/CBS. The enhanced bass response was a deliberate attempt to make the amp more appealing to pedal-steel guitarists who need that extra low-end kick. The dubious diddling with this amp as you suggest would likely cost more than merely buying a '65 blackface re-issue Twin Reverb outright. Most guitarists aren't wrapped around the axle when it comes to henries, farads, and ohms but they do understand dollars and cents.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Fender Twin Reverb 135W Silverface
Posted: Thu Nov 22, 2018 1:05 pm
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I appreciate all angles on this discussion......but I do get that there are opinions that differ and some who are coming from a technical and amp repair/tweaking side of things....and others from the experienced use of these amps in a playing situation coupled with historical knowledge etc...and a combination thereof.

I found TimsAudio's posts interesting.....I have a light understanding of Henries and Farads...Ohms much better....but yes, in the end I am not going to do such mods. I dig where that sent me though....a little research.

I paid $500 for the amp in the early 80's sometime.....I've put a couple hundy into it in terms of "matched" Groove Tubes, servicing and a Power Amp input over the years.......and likely in future I will just have it serviced if I need to.

If anything.....the TRSF will be a great amp to use with the EH B3 pedal......but I doubt I will cart this to gigs. I can pull my damn weight as much as anyone else 30 yrs younger than me......I'm a rigging grip in Film and Television production and my daily work is extremely brutally physical.....so I'm in great shape for my long in the tooth age.

But why do it if you don't really have to? Not to mention the fact, I am becoming increasingly aggravated at my bandmates complete and utter lack of physical output at gigs and rehearsals. The rooms we play at...our rehearsal studio and many of the gigs we do....have drum sets, bass and guitar amps. So it is I and only I who has a complete rig to get on and off stage-because I refuse to get separated from me and my tone. The singer doesn't even bring anything...the horn players a single instrument each.

And while I am on this subject....... :D :lol: I don't want someone in the band coming up to me and asking me...."can I help you with anything?" Because that really means...."Do you have anything really light I can carry in for you?" Just get in there for Pete's sake and grab one end of an amp or my 300lb, or so it seems, pedalboard.....and just help. Don't ask me if you can help in that "OMG I hope he doesn't say yes!" tone. Just do it. Rant over.

Retro.......you mentioned the '65 Re-Issue TR. Are these any good.....is the tone and capabilities that much better than what I have already?

Happy Thanksgiving everyone!! Hope y'all have a great turkey bird day!


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Post subject: Re: Fender Twin Reverb 135W Silverface
Posted: Thu Nov 22, 2018 5:22 pm
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Fumbly wrote:
I can pull my damn weight as much as anyone else 30 yrs younger than me......I'm a rigging grip in Film and Television production and my daily work is extremely brutally physical.....so I'm in great shape for my long in the tooth age.


You're intervertebral's in reality are 30 years older than the people you mention. That UL Twin is just itching to find an uneven surface to let you know that. I'd leave it stock so you're not tempted to actually drag it out. Find a good spot, put an extra support column in the basement under it, and call it a day. It is what it is.

UN


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Post subject: Re: Fender Twin Reverb 135W Silverface
Posted: Thu Nov 22, 2018 9:55 pm
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Fumbly wrote:
Retro.......you mentioned the '65 Re-Issue TR. Are these any good.....is the tone and capabilities that much better than what I have already?


You'll see one in my family portrait amp pic -- third row, on the right.

When I got back into professional full-time playing in 2001, I bought it ostensibly as a spare to my '78 model. Due to its lighter weight I ended up using almost exclusively for the next five or six years, all without incident. The amp is a 1999 edition (no RoHS-compliant solder) that i upgraded with a pair of JBL K120 speakers. I ditched all of the IC electrolytic caps in favor or Sprague Atoms and installed vintage glass throughout for quiet operation and reliability. It sounds for the most part like a vintage blackface TR and I couldn't ask for more.

Arjay

_________________
"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Fender Twin Reverb 135W Silverface
Posted: Fri Nov 23, 2018 9:22 am
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Great, thanks man. I did not know about the solder 'issue'.

upnorth2 wrote:

You're intervertebral's in reality are 30 years older than the people you mention.


I have no idea what you mean brother. Granted I just got up and only had 4 hrs of sleep. :D


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Post subject: Re: Fender Twin Reverb 135W Silverface
Posted: Fri Nov 23, 2018 12:30 pm
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Fumbly wrote:

I have no idea what you mean brother. Granted I just got up and only had 4 hrs of sleep. :D


These.


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