New mods for my '78 JMP 50w.

[Michael R/T]

Kind of hard to tell much difference but seems maybe a little looser. A good thing. Great amp and tone for sure.

Thank for the feedback.

Yeah the amp is a little looser sounding and I'm liking that.

[Michael R/T]

How does it FEEL?
That's what you notice most when making filtering changes.

It feel's smoother, before it felt a little brittle.
It has a more creamy top-end.
The more I'm playing it today, the more I'm liking the changes.

[rgalpin]

sounds real good! that's a ton of gain. you just plugging straight in?

[jnew]

[Michael R/T]

sounds real good! that's a ton of gain. you just plugging straight in?

Thanx.

Yup, plugged straight in.
guitar, cable, amp head.
no boost pedals.

[jnew]

With the exception of some filtering and the PPIMV, our amps are nearly identical. Tone wise as well as I hear that nice hairy grind.

[TJB]

That is definitely better filtering for the VH vibe. The higher value filtering is good if you want a more modern sound or a Steve Via type sound and gives it a harder feel IMHO. Some here like 16uf x 16uf pre amp and some like 32uf x 32uf.
Lower filtering and lower voltage puts you in the VH ball park, for sure.

[jnew]

Agreed.

[Michael R/T]

With the exception of some filtering and the PPIMV, our amps are nearly identical. Tone wise as well as I hear that nice hairy grind.

As soon as I bypassed V2a (820r/.68uF) with another capacitor the gain when over the top.
Do you prefer V1b 2k7 or 820r ??

[Michael R/T]

That is definitely better filtering for the VH vibe. The higher value filtering is good if you want a more modern sound or a Steve Via type sound and gives it a harder feel IMHO. Some here like 16uf x 16uf pre amp and some like 32uf x 32uf.
Lower filtering and lower voltage puts you in the VH ball park, for sure.

Thanx for checking out my clip.

Which preamp filtering do you prefer ??

[N3m0 7h3 Fi5h]

As soon as I bypassed V2a (820r/.68uF) with another capacitor the gain when over the top. Do you prefer V1b 2k7 or 820r ??

You may play resistors or capacitor cathode value :
http://www.ampbooks.com/home/amplifier- ... capacitor/" onclick="window.open(this.href);return false;

1. Pay attention on Gain figure on Low E frek...
2. On Graph see desirable Mid frek. about 1-1.2kHz..

So you get idea.. before swapping cathode resistor or capacitors..

[Michael R/T]

As soon as I bypassed V2a (820r/.68uF) with another capacitor the gain when over the top. Do you prefer V1b 2k7 or 820r ??

You may play resistors or capacitor cathode value :
http://www.ampbooks.com/home/amplifier- ... capacitor/" onclick="window.open(this.href);return false;

1. Pay attention on Gain figure on Low E frek...
2. On Graph see desirable Mid frek. about 1-1.2kHz..

So you get idea.. before swapping cathode resistor or capacitors..

That's a cool calculator.

Thanks for posting that link, I'm going to put that in my favorites.

[jnew]

With the exception of some filtering and the PPIMV, our amps are nearly identical. Tone wise as well as I hear that nice hairy grind.

As soon as I bypassed V2a (820r/.68uF) with another capacitor the gain when over the top.
Do you prefer V1b 2k7 or 820r ??

For the time being, I'm using 820/.68 on V1B and .0022 coupler. On V2, I have only a 330uF.

[SteadyEddie]

I'm digging it. What do you have the volume on ch1 set at? Sounds like it's using that bright cap to thin the excess bass out of it, I love that high end shimmer!

[Michael R/T]

For the time being, I'm using 820/.68 on V1B and .0022 coupler. On V2, I have only a 330uF.

I'm digging it. What do you have the volume on ch1 set at? Sounds like it's using that bright cap to thin the excess bass out of it, I love that high end shimmer!

Thanks for checking out my clips and the kind words.

I had ch1 volume at 3 o'clock.