SFTR - Any Mods for Better Jazz Tone?

Well Blackfacing it will help take the "spike" out of the high end and mellow things out a bit. But, if you don't want to go that route - Have you tried a 12AT7 in the V1 or V2 (not sure which channel you're using) position? And are you running a 12AT7 in the PI spot? Some people swap this for a 12AX7 for more gain.


AL

 

Since many find this the perfect jazz amp (Wes Montgomery for one) this begs the question: "What do you feel the amp lacks for your needs?".

 

If it's headroom you're after then you may want to leave it "as-is". However, headroom on any twin isn't that much of issue. How loud are you playing this guy? Unless you over-ride the Master Volume (not sure if your twin has one or not) you probably won't get much of a break-up until around 5 or 6 - and that'll get the cops called on you in no time.

AL

 

I would not blackface to get a jazz tone. JMHO.

I also read that a 12AT7 is not a good tube for anything other then phase inverter. I would suggest speakers or tubes (12AU7 or 12AY7) to get what your after.

FWIW - I would check with Blue Strat regarding the 12AT7.

 

Not trying to be negative but have you tried it? Where did you read this? I'm sure some players don't like it - I'm not one of them. For certain amps I really prefer a 12AT7 in certain slots. It seems to "warm" things up a bit while lowering the gain. All amps and ears are different.

I agree with checking with Blue Strat on the tubes.

AL

 

"Better" can mean 4 different things to 4 different people. Unless you're specific all your going to get is opinions based on guessing what you like.

 

Then again, many of the tones that we emulate or our jazz heros emulated came from underpowered, dirty tube amps, not 80 watt clean amps.

There's no single answer to any of this.

 

Boy that's true, some of those old recordings you could hear the amp running out of headroom Quick. Then came the Polytone.

 

That noise is usually caused by a bad preamp tube or electrolytics.

While you're in there, I'd recommend measuring all of the tube and power supply voltages and check the bias and matching of the output tubes.

You could also measure resistance values and replace those that are way off. You can measure them in the circuit, but the readings are usually lower. If you find one that's way off, remove one lead to get an accurate measurement.

Some recommend replacing the carbon comp resistors with metal film for lower noise, but this usually removes tone.

 

The first thing I would do is take out those TAD's and replace them with either SED's or the New Tung Sol 6L6GC STR's. I find these to be the best tubes for Fender amps. It's a matter of personal taste but I'm using the Tung Sols and find them warm with a nice transparent woody tone.

 

"That noise is usually caused by a bad preamp tube or electrolytics."

Preamp tubes yes, electrolytics: not likely.

Plate load resistors and tubes are first on the list. Then coupling or tone capacitors.

Electrolytic problems are more associated with hum, lack of power and low end, or blowing fuses.

 

Try some different types of 100K plate resistors. You'll be surprised by the Vishay-Dale MFs, 71-RN65D-F-100K at mouser. Carbon films would be 294-100K-RC. Try 5751's or 12ay7's for V1, V2, and V4. That will darken the tone a bit...I prefer it that way, ymmv. Install a couple beam blockers.

 

Be careful, you may be on the slippery slope to TAA and GAS (Tube Amp Addiction and Gear Aquisition Syndrome).

Webers Michigan speakers are his take on EVs IIRC. I had a Traynor MK III, which is virtually the same circuit as a TR. I didn't like EV or Altecs for jazz tone. Too sharp transient response. EMI GB-12s, Celestion G12-65 and EMI Texas Heat actually pleased my ear more. So at the risk of causing damage to your wallet, speaker swapping may be in order. Alnicos can be good in fixed bias amps, something like a P12N Jensen. YMMV

 

Thought I'd clarify a couple of thinhgs about Wes's Sound if thats the vibe you'd like to feel in your tone WashburnMemphis

First this was his amp. He used a stock Standel Custom 15.




Later a model he colaborated on with Standels owner Bob Crooks The Standel Super Custom XV. The 1965 SS 70 watt version featured two channels. The Normal channel included: Volume, Treble, Bass.




In the above photo of Wes he is shown playing through the Reverb/Vibrato channel which included: Volume, Treble, Bass, Contour (cut only), Reverb, Intensity and Speed.

In know small way the JBL-Lansing 15" High Fidelity speaker contributed to Wes's sound and tone. Along with his thumb and its slight caloused wart nothing shaped Wes's SSound more then this Standel Amp and his own musical genius.





Iactually bid on this amp it went from $1150 to $2700 in 30seconds and I missed it. I believe that price is still a bargain. There is no other amp in its class and quality.

Take a look at this thread I started on the History of Standel and some of the players associated with their Amps.

http://www.thegearpage.net/board/showthread.php?t=358788

EnJoY ThE MuSiC
GrooVey Records

 

A good mod for Fender amps to get some nice jazz tone is adding local negative feedback at the first preamp tube(reverb channel)