LJ20 Help Please!

Wazmeister · May 2018

Ok, I’ll be the one to say it...

A month wait mate ? Wow.

JerkMoans · May 2018

Wazmeister said:

Ok, I’ll be the one to say it...

A month wait mate ? Wow.

Going beyond the near-sexual thrill of delayed gratification, to an almost Zen-like state of inactivity. It’s probably good for me.

DrCornelius · May 2018

Tantric amp repair

JerkMoans · May 2018

DrCornelius said:

Tantric amp repair

ॐ

DrCornelius · May 2018

JerkMoans said:

DrCornelius said:

Tantric amp repair

ॐ

Sorry which one of the Mr Men is that ?

JerkMoans · May 2018

DrCornelius said:

JerkMoans said:

DrCornelius said:

Tantric amp repair

ॐ

Sorry which one of the Mr Men is that ?

Mr Om

Wazmeister · May 2018

JerkMoans said:

Wazmeister said:

Ok, I’ll be the one to say it...

A month wait mate ? Wow.

Going beyond the near-sexual thrill of delayed gratification, to an almost Zen-like state of inactivity. It’s probably good for me.

Great reply... LOL awarded

hoops · June 2018

Still no news. What's happening?

SunDevil · June 2018

It’s going to come back as a Silverface at this rate ;-)

JerkMoans · June 2018

Got it back ten days ago but have been so crazy busy haven't yet had the chance to road test the thing. The good news is that it's all been upgraded to 2018 LJ20 specs so I'm expecting fine, fine things from this bad boy.

...if the demands of selling my surplus labour ever let up...

jpfamps · June 2018

BBBlues said:

DJH83004 said:

BBBlues said:

I think I'd go for one without modules too. Isn't the VAC just a resistor anyway?

No it’s a power mosfet from memory

Ah, a voltage controlled variable resistor?

More likely some form of variable voltage regulator.

I variable resistor (or equivalent) could be used, but it will increase the impedance of the power supply as you turn the power down, which is not ideal.

jpfamps · June 2018

Lebarque said:

The problem with using a reverb pedal in front is that the amount of reverb goes up and down as you use you guitar volume knob to control gain: less with your clean sound and more with dirty (the opposite to how I want it!) Any solutions@StuartMac ?

I was therefore considering getting the reverb module fitted too, but maybe won't bother, if it's not stellar.

Most amps will have this problem to some degree, as the signal sent to the reverb tank varies with the guitar signal (and indeed volume settings on the amp).

Hammond had an ingenious gain reduction circuit in their reverb circuit (an incandescent bulb!), but I've not seen this circuit in a guitar amp.

Perhaps in most amps the tank is driven hard enough at modest volumes that variations in drive don't have that great an effect; reverb tanks don't generate much more reverb once the input is driven beyond a certain point, almost like some form of signal limiting.

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LJ20 Help Please!

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