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FDP Forum / Fender Amps: Vintage (before 1985) / Master pull pot

ChristophK

Germany

Apr 27th, 2019 07:14 AM   Edit   Profile  

While being here, just one question: what exactly does the pull-switch on the Mastervolume-pot do?



Steve Dallman

Merrill, Wisconsin

Age is just a number...mine is big
Apr 27th, 2019 07:44 AM   Edit   Profile  

The "pull master" was a follow up to the pre phase inverter master Fender tried.

Fender added a master as guitar players were trying to get distortion in their amps at a lower volume. But the gain staging in a Fender did not produce decent breakup unless one used a booster in front of the amp to help breakup the preamp.

So Fender added the pull circuit, which "borrowed" a little gain from the reverb circuit to get better breakup from the preamp.

Although generally hated these days, Electronic Musician and other reviews of the day loved it.

Most just leave it pushed in, which acts like it's not even there.

If one wants better distortion in a silverface master or pull master Fender, changing the control to a POST PI master will produce great distortion.

pcalu

usa Thumb area Mi

Apr 28th, 2019 05:23 AM   Edit   Profile  

+1 on the above.

Also depends on what models.

It's not a bad master volume on the whole when you take it for what it is. I often gig a 1975 TR, (yea I know... glutton for punishment? Actually not bad when you use a luggage carrier) I think it was originally an AC568 before I had it BF'ed. The negative feedback design of a Twin Reverb and the wattage makes the amp's headroom extremely high, Using the Master volume I can get what I call a "Gravel Overdrive" i.e. Clean that's not very clean at stage volumes. So for what I use the amp for I think the MV works.

The problem with pull boost is that it's very bright, you basically have to dial in a whole new EQ, so live it's not all that practical.. hence I don't use it.

The UL AA270??? I wonder what the MV does on that. Being UL and an exception amp too (Just not the usual Blackface structure) i.e having a hi-fidelity tonality. As a country/chicken pick'in kinda guy, I gas bad for a UL. I heard a guy using one at a Festival a few years back.. talk about fat articulate cleans, that amp dominated. Since then I heard a lot of Steel Guitar guys love those too.

Cal-Woody

USA/California

Why do I keep fixing things that work?
Apr 28th, 2019 09:53 AM   Edit   Profile  

From my experience with a friend who had an ultralinear version of the Twin Reverb, it was super clean and didn't distort at all and eventually turned it into a stand-alone head and used it for his main amp to just run his pedals through.
He also played steel guitar and used a BandMaster cab to run it through.
It was LOUD and sonic, and he found it to handle the entire range of his pedal steel quite nicely. When using as a combo with the JBL speakers, it was just too bright so he transformed it into a head/cab design and got better lows out of it.
So, if you just want a loud and clean platform for your performance, this amp will definitely do that, but it has more of a sterile characteristics and not dynamic like a Blackface version of the Twin.
That's how I remember his amp. The sealed cabinet gave more definition to the lows and with the broad range that a pedal steel covers, he needed totally clean and clear power to play live shows with the country band he was in.

FDP Forum / Fender Amps: Vintage (before 1985) / Master pull pot




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