convert to HRM

ER · Post by ER » Sat Mar 31, 2012 10:41 pm

You've tried other guitars right? When ever I've had that problem it was guitar wiring. I even had some moron plug a crackling bass into one of my hiwatts and blow it up

dcribbs1412 · Post by **dcribbs1412** » Sun Apr 01, 2012 4:25 am

ER wrote:You've tried other guitars right? When ever I've had that problem it was guitar wiring. I even had some moron plug a crackling bass into one of my hiwatts and blow it up

Hi ER
yes other guitars, input cables , speakers.
This ones got me going in circles...Hope to get it working soon.

Darin

dcribbs1412 · Post by **dcribbs1412** » Mon Apr 02, 2012 3:41 pm

I've replaced all filter caps and its still barking...
also replaced loop jacks...Really wanted to find out what was causing this problem but I guess its time to gut it and start over.

Darin

alvarezh · Post by **alvarezh** » Mon Apr 02, 2012 7:01 pm

You have already proven that the preamp section is good by playing through your other amp's power section. Therefore, just do the HRM's power section (which includes the P.I.). But before doing so, I would try replacing the coupling caps (only on the power section) first.

All the best.

dcribbs1412 · Post by **dcribbs1412** » Mon Apr 02, 2012 9:17 pm

alvarezh wrote:You have already proven that the preamp section is good by playing through your other amp's power section. Therefore, just do the HRM's power section (which includes the P.I.). But before doing so, I would try replacing the coupling caps (only on the power section) first.

All the best.

Thanks alvarezh
replaced PI caps and no go... I hate do overs but will look at this as a chance to redo the lead dress better. Will report back ASAP

Thanks

Darin

CHIP · Post by **CHIP** » Tue Apr 03, 2012 1:28 am

Darin, Maybe try a different Master volume pot, before you redo everything.

dcribbs1412 · Post by **dcribbs1412** » Tue Apr 03, 2012 5:33 pm

CHIP wrote:Darin, Maybe try a different Master volume pot, before you redo everything.

CHIP
that's a good idea...I did try and solder on the back(alpha) and it didn't take so I moved on .Wonder if I killed the pot in doing so.

Darin

Structo · Post by **Structo** » Wed Apr 04, 2012 12:43 pm

Did you happen to measure each pot and watch the meter as you rotated them?

I had two (2!) bad pots on my new build.
They were NOS Allen Bradley too.

Watch the lead dress around the PI.

dcribbs1412 · Post by **dcribbs1412** » Wed Apr 04, 2012 2:02 pm

Structo wrote:Did you happen to measure each pot and watch the meter as you rotated them?

I had two (2!) bad pots on my new build.
They were NOS Allen Bradley too.

Watch the lead dress around the PI.

Thanks Tom
Will do

Darin

Structo · Post by **Structo** » Wed Apr 04, 2012 4:33 pm

Yeah because one jumped from say 100K to 1M before it was even half way!
Anymore I measure everything before committing to solder.

CHIP · Post by **CHIP** » Wed Apr 04, 2012 5:16 pm

Structo wrote:Yeah because one jumped from say 100K to 1M before it was even half way!
Anymore I measure everything before committing to solder.

I had the same situation on my #183 copy build, last year.

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