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Thanks for your help WOPL Sniffer... have only been able to get a peek at this thing for a few minutes here and there so my approach has been scattered rather than anything close to methodical. I will come back after I've finished up my other project, SM in hand and get going on this thing.

I may need some help in determining that from my meter? I put in a signal but there was no passthrough of signal... just a sine wave goes in but none comes out. IIRC, per the service manual there was a signal using the tape monitor, but no signal at all at the output of the preamp. I will...

Was not ready to tear into this yet but had to go sneak a look to double check! This was on both channels but could only hold one at a a time and phone for picture. This is from the preamp out jacks.

Yes, I was glad to come across a deal on one... but just a hobby so have been using what I have on hand. Saw Fluke at a pawn shop and seized the opportunity. But I think it is much more likely operator error (me) rather than the equipment I was using... but having a hell of a lot of fun...

Oh, absolutely anything is possible! The new meter is Fluke 77 (first nice DMM) but just got it so I may have been off in READING it. The O-scope is as cheap as it gets, bottom of the barrel import. My other DMM is a cheap Amazon, not as cheap as the one they give away at HF, but just a...

Crazy... Regarding the 4000, I noticed the 28v on the outputs because to test it I fed a 1k signal into it to test on scope. Then noticed the numbers were strange. Also showed on DMM. Checked again last night, and no longer the case... No sound passes, but when plugged into scope, does...

I’ll take some pics to show. I did get a new DMM so I will check with my old one to in order to double check. But I was showing 28 VDC on the RCA outs. Not .28 or 2.8 but 28 Volts! I will verify with a couple different pieces of equipment and take a pic to show. Also, the phono speaker outs...

Thanks all. Marco, been to Milan and what a beautiful city. Will be happy to replace all of those RCA, as a couple are missing and several broken. Great info on removing boards to just leave the basics, was wondering about that. Just finishing up another project and I"ll be cracking into...

By DCP do you mean a DC protect circuit? I did buy the board and will put that together too.... I have the stuff, may have paid too much for it so I am going to give it a shot to get working. Probably wont sell for much as is so worth it to try. I do have a DBT, DMM and Oscilloscope. No...

Never moving it again sounds like a plan, especially the 700 as I don’t have handles. That’s a lot of transformer

I am a relative novice so forgive what may be a stupid question. I did not see it in either service manual. is there a parts list published for all of the caps on the 4000 preamp? And also for the 700? Would like to recap both, starting with the 700, it is an early one.

Yep, thats the model... always thought these looked so cool. Well if it is too far gone will go for parts but hoping to get started on it soon. 700 as well. Both of them cleaned up pretty nice and hope to get them singing after a couple other projects.

Safe to say this is not stock! But coming together nice just cleaning it up. Was a hoarder’s situation

Thanks for the info, man do I have a lot to learn! This one also has 1/4 inch speaker outputs added, I assumed those were later additions based on the fact that they were marked with Dymo tape to indicate left/right. Mine appears to be a very early 700 will try to get pics after cleanup

Confirmed 29V DC on the RCA out on the 4000 Preamp! And I just noticed that someone had replaced the RCA inputs on my early 700 power amp with 1/4 inch phono jacks so must have done time as a PA amp! Will get those replaced with RCA and see if things are working... came up fine on dim bulb...

Yes, I was shocked... I will get the actual exact number when I get home to my meter. I never even thought to check for high DC on a preamp... then I looked at my oscilloscope and saw the voltages when looking for a clean sine wave I fed into it... I thought "oh, that CANT be right." and...

That's the plan! But, wanted to try to fix the one issue before doing that so I could learn from it... Plan was to reflow all solder joints, replace all of the RCA jacks, and recap. But wanted to get working first.

I have a fairly beat PL 4000 here, always thought they were cool but stumbled across this and a 700 and could not pass it up. Both rough condition. I have a bit of vintage repair under my belt, far from an expert. No sound on this one... but surprisingly getting VERY high DC at the outputs...