Re: Marshall JMP 2204 - cascaded preamp question

Smak! wrote:
adam79 wrote:

to anyone that has played both a non-cascaded and cascaded 2204, what exactly is the difference? Does it just give the amp more gain?


I owned a 1980 Park 50 watt head that had the channels cascaded and a master volume added. If you plugged into the far right input jacks you were playing through both channels with more gain than normal and you could control the amount of gain with each volume control (I just turned them all the way up) and then with the master volume knob. But if you plugged into the left input jacks the amp acted and sounded like a regular Marshall master volume amp, or you could crank the master all the way up and use the regular volume control like a non master Marshall head.

Jeff

Good to see a non-sales post!

Was this the amp that has an odd footswitch option? I'm trying to remember details, because it's just a schematic that I might use to finish a mod that I'm using. But it seems to me that you plug the guitar into the footswitch itself (and it plugs into the amp, of course).

I started a mod on a Univox U-1061 that has the same tube compliment, input jack and pot configuration as a Super Lead. I simply cascaded the two preamps, so it's like what you describe. If I plug into channel A, it cascades through channel B, and you control volume at each pot. ....and I added a master volume, of course. I can still plug into channel B if I want.

When I described this to a guy that owns an amp company, he passed on the Park idea and schematic. He told me that this particular Park was almost Marshall's choice for the first Master Volume, but then they went with the 2204.

BTW, I gotta say that if any of you run across the old 105W Univox amps, check them out. It runs 6L6GC at 685V on the plates, and is a real powerhouse. The U-1061 is the bass version (but VERY similar to a Super Bass or Super Lead), and they also made a guitar version (I think with trem and reverb).
.

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