Ginger Clone Project Progress (Completed!!!)

[UR12]

what value did you use for Rgs?

At the time I built the amp I didn't have a 2.2k so I used a 1.5k.

[JimiB]

seems like that would be another cool place to play with a trim pot- might sound better with nothig there-
Just tryin to find your sustain-

[Richie]

he left it here for me to try.. as of now the resistor is gone... i liked it better with it out. A very subtle difference,but noticable.

Richie

[Mark]

Dear Richie

What was the effect of the resistor, how would you describe it?

[Richie]

just seemed to knock down some of the signal..or a sligth volume change..

More noticble when the amp was turned down,you could hear the difference better of how the amp had a little bump in signal.

A similar way to explain it...Kind of like if you were useing a pedal,and had the volume of the pedal on 6.. with the resistor in.. it would been more like you roll the pedal down on the volume a notch.

So far.. the 150k stays.. and the resitor on the tube socket as noted above..is removed.

Richie

[Doug H]

First off, Dana, no apologies necessary! Sorry if I came across impatient in the last post, I was just in a hurry and didn't have time for more words.

Thanks for sharing the results of your experiments. I may give the 150k a try.

I am using 820ohm for Rgs which is left over from an earlier express experiment. I assumed that was to squelch oscillation and wouldn't really affect the tone very much.

FWIW, I experimented with a 470p for the "treble" cap in the tone stack (like an express) and that was a definite no go... Sounded very harsh in the mids. The 50p sounded "just right" to me. The 470p worked well in an "express-like" circuit I experimented with and I suspect the difference may be in the way the PI's are set up (?).

The one thing I had hoped for, more sustain like the Express, didn't happen.

I'm sorry you're having trouble with that. Mine sustains like crazy. With gain on 12:00 if I take my left hand off the fingerboard the strings start singing by themselves. It's very responsive.

Doug

[Richie]

Doug.. what guitar are you useing or pickups ..

Richie

[UR12]

I may give the 150k a try.

Let me know how that works out for you.

I am using 820ohm for Rgs which is left over from an earlier express experiment. I assumed that was to squelch oscillation and wouldn't really affect the tone very much.

Mark stated that some people had left this resistor out and if it was used it's value had been seen as 820 - 2.2k. If it's there to kill osc then it may not be needed if your amp doesn't oscillate. After removing the resistor Richie left the shield of the shielded cable connected to B+ on pin 6.

FWIW, I experimented with a 470p for the "treble" cap in the tone stack (like an express) and that was a definite no go... Sounded very harsh in the mids. The 50p sounded "just right" to me. The 470p worked well in an "express-like" circuit I experimented with and I suspect the difference may be in the way the PI's are set up (?).

I'm using a stock Liverpool values of 1k, 39k, 1m in the PI. Is your's different?

The one thing I had hoped for, more sustain like the Express, didn't happen.

I'm sorry you're having trouble with that. Mine sustains like crazy. With gain on 12:00 if I take my left hand off the fingerboard the strings start singing by themselves. It's very responsive.

Doug

Hmmmmm...... Mine has good sustain but nothing like the Express we built. The Express will Literally hold a note forever. Now you have me curious about maybe the sustain I am looking for may be in the PI or power section.

Thanks!!
Dana

[Doug H]

Mark stated that some people had left this resistor out and if it was used it's value had been seen as 820 - 2.2k. If it's there to kill osc then it may not be needed if your amp doesn't oscillate. After removing the resistor Richie left the shield of the shielded cable connected to B+ on pin 6.

I didn't connect the shield to B+ (or the plate actually). I connected it to the gnd lug of the volume pot. I don't like the idea of hooking shields to B+, it just bugs me.

I'm using a stock Liverpool values of 1k, 39k, 1m in the PI. Is your's different?

Yeah, that's what I'm using. What I meant was the Express PI is set up differently and I suspect that's one reason why the 470p treble cap may work better in that amp.


Doug

[Doug H]

Doug.. what guitar are you useing or pickups ..

Richie

I'm using a solid body (paulish) hamer with dimarzio super distortion humbucker bridge, paf neck. I have one of the neck paf coils shut off for "single coil" sound.

Doug

[Richie]

i was useing the strat,since this amp is hailed for strats and teles.... so it doesn't have the hot pickups like what you played in yours..

I do have a old USA 83 Kramer Pacer Imperial.. it has the same pickup you have.. and a PAF pro.. and that guitar. and my les paul does,what you describe..

The amp will sing..if its turned up a bit more.. But we were keeping the seetings close to the express..to see how they compared,and responed.

But yeah..this amp is not just for Strats and teles..i really like the LP guitar in this amp too..

Richie

[UR12]

I didn't connect the shield to B+ (or the plate actually). I connected it to the gnd lug of the volume pot. I don't like the idea of hooking shields to B+, it just bugs me.

I know what ya mean. I thought that Ken connecting to the plate or pin 6 may have also been a way he used at cutting down on Osc.

Thanks for the reply!

[Mark]

Dear Richie, Doug and Dana

Firstly Richie thanks for your reply. I for reasons I don’t understand, I never experimented with the grid stopper resistor?

The Liverpool's that I have photo's of both use the shield of the co-ax connected to the plate of the stage after the volume control. I did experiment with grounding the shield and (removing it and) attaching it to the plate. I expected to hear high frequencies being shunted, but this wasn't the case.

Many years ago I tried the Kendrick mod where you do a similar thing to the co-ax cable on the input of the amp (my 6G7a Bandmaster) this resulted in a loss of high frequencies.

As far as what amp the Liverpool is best suited for, I agree with Richie.
I do have a recording somewhere of a Strat being played through a real Liverpool and I much prefer the next recording where a PRS is used. I also felt this way about the Liverpool prototype amp that I built.

As far as gain goes in the Liverpool amp, I was quite happy with the 68K resistor and my findings were in line with what Doug said. I do recall having a 150K in there at one stage, but I pulled it out, I can't remember why I did that?

I was very happy with the Rocket when it came to Strat tones, but then again, I've ranted about that amp long enough. I was thinking of resurrecting my Rocket clone and doing those recording that I never got around to doing. Hmm?

The amp was a two EL-84's amp and the output transformer was a New Sensor 22913 (from memory.)

[ken]

The possibility also the original Schematic GINGER buying it will not be the bedspread?

[MooreCowbelle]

The possibility also the original Schematic GINGER buying it will not be the bedspread?

Wow. Ken, I can't even guess what your question means.