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Thanks for the additional explanation. I ended up being able to brute force them out with a pair of pliers and a flat head screwdriver. However putting in the new diodes will certainly require more finesse. I’ll try the vice and washer method. That sounds like a clever way to do it. Thanks again!

Hello, It sound like you have some experience with a similar issue I'm having. I'm trying to replace the 1n3492r and 1n3492 diodes in my mc2105. I was able to source new press fit diodes from digikey. However I am at a complete loss on how to remove the old diodes from the metal brackets...

Thanks for all your help! I'm still trying to contact sun audio. Others have seemed to have luck with repeated contact. However, If this path proves impossible I'll likely follow your helpful recommendation BuzzK.

Thanks for your reply! Still nothing from Sun Audio. I plan to fax them and call them today. I reached out to Tamura, but haven't heard back yet. I actually did reach out to Devin Turnbull but he replied that Sun audio will not sell transformers only. It seems the support on these amps from...

Hi, Did you ever find a spt-150a? I’m in a somewhat similar situation and am hoping to find the 120v transformer. I emailed sun audio multiple times but they never replied to any of my inquiries. Can you please let me know if you resolved your situation? And if so where did you purchase from...

Thanks all for your recommendations and information! Your feedback is incredibly valuable. While checking I found that one of the output transistors was shorted (probably more were, but I didn't check all of them). So I went ahead and replaced all 12 with MJ15003G transistors. After I plugged...

Thanks so much Bob. I'll connect a dim bulb tester and start checking. My first stop will be the rectifiers (2 1N3492 and 2 1N3492R ) on the filter caps. I may even just replace them anyway. Would the original diodes be preferred (looks like they are still available) or would the...

Hello all, I recently acquired a cosmetically very good condition MC2105. When I first attempted to turn the unit on nothing lit up, but the meters did a weak "bump" and then went back to resting. There was no function after that. I then proceeded to replace the filter caps (triple checked...

Hi all, Thanks so much for getting back to me, I've been traveling and haven't been checking in regularly.. I'm unsure if the problem existed prior to recapping, there was a channel that kept going out (I don't remember which one, maybe it was the left one?) out so I decided I would proceed...

Hi all, I've recently, extensively, recapped the filter caps, amp boards, power supply, and preamp boards of my 2275. I get what often sounds like "good sound" from both channels, but when playing music emphasizing higher frequency sounds such as piano music, chimes, classical, etc... I get...

I know this was like 12 years ago, but thanks for helping me with my issue! same exact problem and remedy. Cheers!

Hi, Thanks so much for your reply! I wanted to follow up as I found the issue and hopefully the next person to run into this problem may benefit from my mistake. It turns out h713 and 714 are the culprit. I had replaced them with MJE15030 and MJE15031 respectively. These run at higher...

Hi again all, I'm having trouble identifying a problem leading to a high bias on my p700 boards. I couldn't find thread with a solution to this issue. I recently replaced all of the capacitors (film, 'lytics, and ceramic), transistors (big, medium and small), the big round outputs, and...

Hi all, I just wanted to thank you all again and follow up on my repair. The operation was a success! I did have to modify the new switch shaft to fit by shortening it a bit and adding a slope to the end (using sandpaper) so that it would interact with the power switch appropriately...

Hi all, Perfect. Thanks so much for your help! I reattached the red wire to j804 and everything seems to be working!

Hi all, Thanks so much for your help and valuable input. Given how short the wire red wire is it wouldn't be able to connect to any boards other than the P800 or the PT01 (which does not show a connection to the JE01 Pin 5 in the schematic as dankik noted). So I suppose it has to be the...

Hi ocdecio, It looks like there is already a red wire attached to J804 on the power supply board. Would two red wires from different areas be attached to the same pin J804 ?

Hi all, The fun continues. After repairing various issues with my Marantz 2275 I went about returning the PE 01 board back to it's proper position to test the unit . While re-seating the PE 01 Tone board, I noticed the red wire (corresponding to pin # 5) from the female portion of the 7 pin...

Hi all, Thanks for all your help! I ordered some JB Plastic weld to repair the old one (gorilla glue epoxy and gorilla glue superglue were pretty much useless in prior attempts to repair the old shaft). In the mean time I reached out to Randy, AKA runningdog on Audiokarma, at IRebuildMarantz...

Thanks again. Unfortunately there doesn’t seem to be a “full” replacement for the marantz 2275 switch (unlike the 2270 and others). I think I may have to purchase an alternate models switch and repurpose the shaft to fix my issue. I wonder which model switch would contain the appropriate shaft...

Hi Steven, thanks for your reply. I did see that part and actually emailed this exact seller. Unfortunately the part I need is the plastic button shaft. My actual soldered power switch is functioning ok, but it can’t be used due to the broken button shaft.

Hi all, Well, after many hours of recapping my 2275 I ended up bending the power button while taking the unit off my desk. Unfortunately that little white plastic plunger/shaft is snapped. I cant seem to find a replacement for this anywhere. This little brittle plastic piece in an otherwise...

Thanks you all for your help!! I'll try making sure the plug is in the correct orientation first (I never thought of the plug being polarized!). Then potentially change the cord itself if the issue persists. Also, I'll refrain from changing RCA inputs with the amp on. Hopefully this will...

Wow! a "death cap" sounds terrifying. I'll have a look for this and see what I can find. I had considered swapping out the thin "lamp cord" power cord with a more robust 3 prong grounded power cord. I wonder if this is typically done with these amps. I certainly wouldn't get anything crazy...

Hi, Thanks for your response. It has been rebuilt. Power supply is new and all capacitors have been replaced. Resistors are largely original Allen Bradleys. However, I admit that I did the work on the amp personally and while I am competent in replacing/soldering components (thanks to this...