Plexi Rehab

Marshall Amp Discussion

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BillyBob
Posts: 44
Joined: Mon Dec 05, 2016 2:39 am
Location: North Carolina

Re: Plexi Rehab

Post by BillyBob » Sat Dec 23, 2017 10:07 pm

Hello,
Thanks for the guidance.
I got this sucker re-capped, and it sounds great.
I got back some edge and crunch.
I didnt change any of the values. I saved the old stuff.

Time to put it back in the box and play on.

Plexi is a beautiful thing..

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martin manning
Posts: 8088
Joined: Sun Jul 06, 2008 12:43 am
Location: 39.1N, 84.5W

Re: Plexi Rehab

Post by martin manning » Sat Dec 23, 2017 11:25 pm

Good to hear. So just a refresh of the main power and bias supply caps, and the V1a/b cathode bypass cap, with everything else as it was?

BillyBob
Posts: 44
Joined: Mon Dec 05, 2016 2:39 am
Location: North Carolina

Re: Plexi Rehab

Post by BillyBob » Mon Jan 01, 2018 6:03 am

Hello,
Sorry for the late reply. I was travelling for the holidays.
I replaced all the power filter caps, and all other caps on the turret board (except the large flat rectangular ceramic).
I also replaced the cap on the back of the Presence pot.
Regards,
Bill

RockinRocket
Posts: 435
Joined: Sun Nov 20, 2011 5:23 am

Re: Plexi Rehab

Post by RockinRocket » Thu Feb 01, 2018 5:35 am

I hope you did not replace the "mustard" caps ? Those rarely fail and are considered "tone" caps and important to the value of the amp.

Does this amp have plexi panels? Or is it a brushed metal?
I'm thinking its the latter, and in this case should put it at mid 69 at the earliest but more likely early 70 with the standup power transformer.

BillyBob
Posts: 44
Joined: Mon Dec 05, 2016 2:39 am
Location: North Carolina

Re: Plexi Rehab

Post by BillyBob » Sun Feb 04, 2018 5:59 am

Hello,
Thanks for the message.
Yes, the amp does have plexi panels.
Sadly, there are two extra holes in the back panel from some kind of mod in the past.
So the value has already taken a hit. (not that I would ever sell it, it was my main amp from back in the day).

I did remove the mustard caps. I used the Sozo vintage caps as replacements.
Knowing that the mustard caps are vintage "tone" components I set them aside for possible inspection and re-install in the future.

The amp sounds better now.
Previously I found myself not playing it due to degraded tone.

It sounds wonderful when it hits it's sweet spot.

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