repair

Hello all, I’m exploring a possible repair on a Pioneer SA-1490 receiver I got from a friend who insists it was working for him before giving to me. I’d like to save it from the recycle pile but it’s not working now. Two sentences about me. Although trained as a EE, I’ve leaned on more of the...

I'm currently having an issue on my 9090DB where the protection light does not come on and it does not click. From digging around forums, I believe that the F-2624 board is the problem. Attached are the resistor values that I obtained, photos of the board, and a fusible resistors that looks and...

Hi, I am restoring a Luxman L560, and I need to find a power switch. Please get in touch with me if you know where to find it. Also, I need to find a service manual

Hi all, as the title says, I have a couple small but annoying problems with this rare quadraphonic receiver. I think I know what the issues are but this is my first time trying to track down and rectify such problems. I'd like some guidance on where to look for my problems and what to replace...

Hello, does anyone have the manual for either the Project One Mark 1500, or Telefunken TR-1500 DC?

Hi guys, I recently acquired a pair of Klipsch Chorus ii speakers, but one of the speaker has both of the speaker connecting post broken. Klipsch didn't have a replacement part, given these are older speakers. Does anyone have any replacement part suggestions? I saw some parts on ebay, amazon...

I have found some burned 2SC4029 and 2SA1553 output transistors. I also found some new MJL transistors laying around. Is it god idea to swap to MJL21194G and MJL21193G ?? What different dose it make to the sound and funktion off the amp ? In the manual is it MJL transistors. Why is the amp...

Hi everyone, I'm working on a vintage Pioneer DT-500 Audio Digital Timer and hitting some perplexing display issues. I believe it's an NE model (220V 50Hz, no external voltage/frequency switches). This unit was not used and not connected to electricity for over 20 years before I recently...

Hello All, I have recently picked up a seemingly very nice 1988 Sony CDP-970 CD Player, and appear to have hit a snag attempting to repair it. The issue is that when I insert a disc, the mechanism that lifts the motor up to spin the disk does not come up all the way. Taking off the top clamp...

I recently was able to buy a Sytemdek IIX that appears to be an early model (steel bottom, teardrop armboard). When the power switch was clicked on nothing would happen. I researched a bit and thought it would be the capacitor but ultimately turned out to be the switch that was faulty. I've...

Hi All, I am in need of a well regarded and trusted service engineer for some older high end amps. Based in the UK. Specifically; Mark Levinson 33h, 334 & 27.5 ECS EA-2 Currently the ECS is the only amplifier which actually needs repair - dropping out on one channel. God help me when the...

I recently rescued a Yamaha KX-W900 dual cassette deck from being sent to the big landfill in the sky. What a lovely machine. The reason it was about to be destroyed was that deck "A" would not play and had a stuck tape inside it. Removing the front panel and looking at the mechanism from below...

I got a Dual 1229 which came with the headshell (not the sled) broken where it meets the tonearm. I was succesfully able to reattach it to the tonearm with super glue, and it seems to have held up. Anyways, I was wondering what effect this has on sound quality, as I never had the chance to hear...

Hi, this is my first post to this forum and I know very little about record players. I purchased a dual 601 refurbished a year ago, and the speed selector has always acted up, specifically switching it from 45 to 33. When I switch the speed back from 45 to 33 the belt gets stuck in the middle...

I am working on a Marantz for a client who states it stoped opening and closing... my troubleshooting process, using a Fluke 116 only I came to the conclusion U403 on the disc driver board is bad... Linear Voltage Regulator BA25BC0-photo attached. im sure you all know manufacturer schematics...

I'm finally restoring my inherited Quad 303! I'm following this guide: https://www.rs-online.com/designspark/refurbishing-a-classic-quad-303-amplifier I've replaced all the capacitors and everything went good ;) Now to the problem: Adjust RV100 for 33.5 volts between tags 5 and 9 One of...

Hi all, I’m in the process of refurbing a Sansui 9090 I’ve had in long term storage. I’ve come across two mods which I’m not sure if I should replicate in the restoration or bring back to original design and hoping someone can help Last I used this was over a decade it worked however always had...

Read the article here: https://ultraferric.com/blogs/news/nakamichi-mr-bx-idler-tire-replacement-diy-cassette-deck-fix Have a great day, and TAPE IT EASY!

Hey I picked up a set of these little while ago and just got around to taking a closer look. One is in perfect working condition no problems at all. The other the woofer is not working. its part number looks different than the one in the spec sheet and am curious about that its a #902-7298N and...

Hey guys! So, i got myself quite a task. Purchased a Burmester 933 amp, stated as defect, "doesn't function since some time, LED doesn't turn on". Price was good, so why not, let's give it a try. Came home, opened it up and discovered with great horror/surprise that 2 caps were missing on one...

I got a little carried away yesterday morning and accidentally won an auction for a Scott 340b with a nice wood case. I got it for a decent price but will have to pay for shipping — and I have no idea what shape the receiver is in, other than that it's cosmetically pretty good. Even if it starts...

Hi All - I'm new to the group and just got (for free) a Velodyne ULD-15 Subwoofer Series II that has no foam. It was posted (from the daughter of the original owner) a properly working when put into storage 4 years ago and other than the foam looks in mint condition (beautiful cabinet and amp...

Oops I think I forgot to edit my title. But it's not entirely out of the question regardless. I was working at a church last night and installing a new Leslie for them that I rebuilt and I saw this rather generic looking speaker box over in the corner but it had a shape kind of familiar so I...

KS-1 sealed sides and corners

I recently bought a pair of ESL-63s via CL for $300. One speaker plays fine, the other makes lots of noise. I have started the repair process on the noisy speaker. I'll go through the other one after I get the bad one working properly. Right now I'm looking for suitable replacements for all the...