Peavey Backstage Plus 35W Guitar Amp

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Peavey Backstage Plus 35W Guitar Amp

Postby DrNomis » 04 Mar 2015, 07:20

Hi Everyone,


I've just recently been given a Peavey Backstage Plus 35W Solid State guitar amp for nothing, and I'm currently working on it to get it back to a useable state, so, what's wrong with it?

Well, the original speaker is a no-worker but the rest of the amp seems to work fine, I verified this by plugging my pair of headphones into the headphone socket, I get normal sound through my headphones but no sound through the speaker.... :thumbsup


I've managed to find what I think should be a good replacement on the Musician's Friend website, the replacement speaker I have selected and ordered online is a 10 inch Jensen C10Q speaker.


Also managed to find some good/readable schematics for it online too...... :thumbsup


The other thing wrong with the amp is R63, a 22 Ohm /1W resistor, is burnt out so I'll be replacing R63 with a new one..... :thumbsup


The only other thing the amp needs is all the pots sprayed with contact cleaner, which I've already done..... :thumbsup


Finally, one mod I'm going to make to the amp is to replace the original power indicator led with a blue one...... :thumbsup

Another mod I'm going to do is replace all the 4558 op amp ICs with TLO72CP....... :thumbsup


And also make a footswitch for the amp as well..... :thumbsup


Anyway, just thought I would post the schematics for any one interested in downloading a copy:
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Re: Peavey Backstage Plus 35W Guitar Amp

Postby DrNomis » 05 Mar 2015, 05:43

Update:


Replaced the burnt-out R63 resistor, and done all the mods I wanted to do, everything went fine so now all I'm waiting on is the new Jensen C10Q replacement speaker..... :thumbsup


Also made a footswitch for my Peavey Backstage Plus amp as well since both the Saturation (Distortion) and the Reverb are footswitchable, this amp is shaping up to be quite a useful little amp, been surfing the Internet for info about this amp and have read lots of good things about it, apparently it's a loud amp for it's size and power, also read that it works well with stompboxes...... :thumbsup
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Re: Peavey Backstage Plus 35W Guitar Amp

Postby DrNomis » 17 Mar 2015, 09:08

Update:


Three of the pots have failed, basically the carbon paint on the resistive track has flaked off so the pots need replacing, the pot for the Saturation control is a dual-gang type but one of the resistive tracks is 1k so it's not as simple as just replacing it with a dual-gang 10k pot, the other one is 10k, the Post control pot, 10k, also needs replacing as well as the reverb pot,10, have tried seeing if some pots from Jaycar would work, they won't.... :hmmm:


Just wondering where I can buy a complete set of new replacement pots for my Peavey Backstage plus...... :hmmm:
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Re: Peavey Backstage Plus 35W Guitar Amp

Postby bajaman » 17 Mar 2015, 10:32

those pots are crappy - try your local Peavey agent for spares :wink:
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Re: Peavey Backstage Plus 35W Guitar Amp

Postby DrNomis » 17 Mar 2015, 12:09

bajaman wrote:those pots are crappy - try your local Peavey agent for spares :wink:



Will do, been doing some googling for new pots too, but looks like I'll probably have to see if I can order some from Peavey USA, was hoping I could order them from a Peavey agent in Australia, I'm pretty keen on getting my Peavey Backstage Plus going again since it was sounding good before the pots failed, the Jensen C10Q speaker I bought for it was a great choice..... :thumbsup
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Re: Peavey Backstage Plus 35W Guitar Amp

Postby clintrubber » 30 Mar 2018, 15:43

Hi,

Curious if you managed to find that non-standard dual pot for the saturation-position?
Have a 'non-Plus' Backstage upcoming which uses the same pot, and it seems to be scratchy...

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Re: Peavey Backstage Plus 35W Guitar Amp

Postby microbailey » 30 Mar 2018, 20:56

I'm currently modifying an early 00's Peavey Bandit (see the thread "My mission to modify a Peavey Bandit into a boutique amp" I've got going on here) and I'm replacing a couple of the crackly pots.
I know for that amp the Marshall spare pots are the same as Peavey used originally.
I don't know where you're based but in the UK I buy my replacement pots (including Peavey/Marshall) from Hotrox (hotroxuk.com)
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Re: Peavey Backstage Plus 35W Guitar Amp

Postby clintrubber » 06 Apr 2018, 11:54

microbailey wrote: from Hotrox (hotroxuk.com)


The amp has arrived, pots are indeed a bit scratchy, but all functional, so hope just some spraying will do for now.

Thanks for the Hotrox-info, might come in handy... Might be good that I have a look already for a spare saturation-pot since that'll be the most difficult part to obtain.

Good luck with the Bandit!

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Re: Peavey Backstage Plus 35W Guitar Amp

Postby clintrubber » 06 Apr 2018, 11:56

FWIW: having a Backstage 30 and a later Backstage (coloured knobs, reverb, satur.-circ.) side by side,
it's interesting/boring/(ir)relevant to see the changes they've made:

-to my surprise the cabinet height of the latter is slightly less.
-the alu side-trims on the baffle are smaller for the latter, and seem to be plastic now :shock:
-'rougher' (more 3D) tolex
-the nice 3D front panel of the '30' changed into a simple silkscreened version for the latter
-both logo's seem plastic, but I understood a metal logo also existed - perhaps on the bigger amps only ?
-I guess I don't have to mention the change from the ubercool Sputnik-style alu-knobs to the conveniently coloured but fully unvibey plastic knobs :hmmm:

Al in all, the latter seems to be a bit more streamlined... in other words, where production costs could be saved
they've done so. That's how things go.

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