Modulus "Deepfried Marshbar" build debugging!

[JMPGuitars]

After making this change I couldn't really tell any difference. It did give me a good excuse to tidy up the input jack wiring though!

"If the input resistor material is a source of hiss" is the key part as to whether or not there will be a noticeable change. Also, even if it is a source of hiss, if there are other sources that are worse, you might not be able to tell the difference. I use MF for almost all resistors in an amp, so I don't generally have any hiss issues.

Besides that, you might need to record a before and after sample to tell the difference if it's a mild change.

Always good to tidy things up.

[whboyd]

The diagram in the first post here reminded me of this issue I recently posted regarding Mojotone kits, etc. I recommend changing this layout esp. if you ever plan to run vintage tubes (or even some modern european ones!

"MOJOTONE shows the screen grid and control grid resistors wired to pins 2 & 6 and 1 & 9 respectively. While this may seem to be ok as these are often shown as "not connected" or "unused" on tube charts, when I fired it up the first time to test, one of my (MULLARD) EL84s glowed bright red. Turned down the variac and started testing voltages finding an inexplicable high voltage on the control grid. After running out of explanations, i pulled out one of this pair of Mullard tubes & discovered pins 1& 2 were actually INTERNALLY CONNECTED! - But only one of them! So I went back, installed lug strips and tied the grid resistors to it removing them from the sockets. ANYONE using a MOJOTONE kit or schematic (or this scheme) need to be aware of this issue - it may be that using modern tubes or certian brands might have been fine - but who wouln't want to use Vintage Mullard EL84s in a British type Marshall type amp? I've built dozens of EL84 amps over the years but never knew about this issue until now. Never tried to use the N/C pins for components before though."