Traynor YBA-1 Midrange Dip

Dennis Detweiler · From: Solon, Iowa, US

I'd like to get less midrange. I have the control full left and still need less. I currently have an orange drop .022 in the mid tone stack. Use a different value cap? Or, another place on the board to create the dip?
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8.

Brad Sarno · From: St. Louis, MO USA

What's the rest of the tone stack circuit look like? Fender? Marshall?

Sometimes to get more dip when the mid control is bottomed out, the only way for more dip is to turn UP the bass and treble. Likely the mid pot turned down is ZERO resistance, so you can't really dip more than that with the mid part of the circuit. The cap values can move things around in frequency, but not attenuation.

B

Dennis Detweiler · From: Solon, Iowa, US

It's close to Fender. I'm running bass control full on and it's using .1 cap. Maybe need a little bigger?
Treble is plenty bright and cutting it at around 11:00. The treble cap frequency might be a little on the high side of what I'm used to hearing?
Presence is off, but doesn't add much.
I don't know where the frequencies are at each control. I can't find a website that designates. So, that might be why I can't dial it close enough for my 8 string lap steel (alumitone pickup). It's probably more suited for a tele?
Overall, it's not bad, but just a little short of what I want to hear.
I'm not a wizard with electronics, but can add mod parts or upgrade kits to amps or radios.
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8.

Stephen Cowell · From: Round Rock, Texas, USA

The answer is always to download Duncan's Tone Stack Calculator and play with the values... you can change the value of the Mid pot and this moves stuff around too.
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Too much junk to list... always getting more.

Brad Sarno · From: St. Louis, MO USA

The larger bass cap won't give you "more" bass. It'll only extend the low end of the frequency response and likely into territory of sub-bass mud you DON'T want.

What kind of cabinet are you using with it? It sounds like you're at the full extremes a tone-stack can offer, and if that's not enough dip in the mids, maybe something's off or the cabinet isn't tuned to your liking.

If the bass cap is a .1uF, is the mid cap a .047uF? Is the slope resistor a 100k?
Treble cap 250pf?

B

John Limbach · From: Billings, Montana, USA

If you haven't already, go to this website and read through or download the mod info. Essentially you can make the YBA-1 nearly identical to the early Fender Bassman. Sounds interesting. I have a YBA-3 Bass Amp that I'm getting ready to work on.

www.kilback.net/traynortweaks.htm

Dennis Detweiler · From: Solon, Iowa, US

Using a D-130F open back cabinet.
1971 Traynor YBA-1 Bassmaster
Bass cap is .1 (original was .1)
Mid cap is .o22 (original was .02)
Treble cap is 250pf (original was 270)
Original resistor was and still (47k)
Right now, the treble cap is the only big change. I used to have more control over the bass and could set it around noon or 1:00 to get close to what I wanted. Now I have to set it full right.
I always had to set the mid to full left to get the dip. Still that way, but the mid sounds like it cutting somewhere above 800hz? It's lacking that sweet spot dip in the mid and getting a little honk in the treble. Adding more treble gets tin. Presence is full left.
That's as near as I can describe in words.
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8.

Dennis Detweiler · From: Solon, Iowa, US

John, I tried changing the tone stack to the mod that Kilback recommended and didn't like it, so changed back. However, I haven't switched back to the 270 treble cap yet. The switch to .022 bass cap left me with a huge cut in bass, which I didn't like.
The only other change I made and kept was the 250k to 1 meg volume control. I like the sweep much better.
I think the Kilback mod is geared for rock guitar players. Doesn't seem to sound good for steel guitar pickups.
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1975 Birdseye U-12 MSA with Telonics X-12 pickup, Revelation preamp, Carbon Copy Delay and Hall Of Fame Reverb, Crown XLS 1002, 2- 15" Eminence Wheelhouse speakers, ShoBud Pedal, Effects Pedals. 1949 Epiphone D-8.

John Limbach · From: Billings, Montana, USA

Good thing to know, Dennis. Will undoubtedly save me time and effort. I've got an extra speaker and am buying a 12-cab now. Once I have that I'm going to fire up the YBA-3 and see if it works and hopefully get a baseline sound and tone before I start tinkering.

Have always heard great things about the early Traynor amps.

Am watching your progress closely.

Thanks!

John Limbach · From: Billings, Montana, USA

Anything new to report, Dennis?

Don't know why I was calling it a YBA-3, when it!s actually a 1973 YBA-1.

It's working now but has some hum and is pretty hot. I plan to work it one mod at a time so I can go back to stock values if I don't like how it sounds.

First the grounded power cord and then replacing the electrolytics. Eventually will replace all the audio caps with Jupiter's.

Did you try the channel two defeat mod? Would be easy to test drive that with a simple "snip".

Will let you know it goes. I will only be using it with lap steels, most often a D8 Stringmaster and a 1950ish Ricky bakelite.

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