diode

I’m trying to identify modern components to replace diode bridges H801 and H802 on the power supply board (P800) of a 2225. After much searching, I can’t seem to find any information about these components’ specifications. The part numbers are: H801: HD2001508; description SS-3R H802...

Merry Christmas AK'ers! I could use a little help solving a blown fuse problem on a SX-727. This unit was my first recap project, done 4 years ago. Following AK threads I bravely dug into a SX-727 to recap it, but little did I know how hard/easy it was! I figured even if it blew up it could...

Just want to check whether this photo shows a VD 1212 varistor, next to its printed symbol on the pcb, facing the WRONG way? It’s currently residing in a Yamaha C4 preamp on the Function Board. Also, what’s the best way to test these components out of circuit.. a DMM or a cheap transistor...

Checking these. With one leg lifted should they read Diode test : 1184 Ohms: 5.61M ohm With leads reversed, (Black lead on black end, red on red red end of diode) on the DMM at 20M ohms it climbs to ‘I’ I know these things have a dreadful reputation but just wondered if this one was...

I'm restoring a portable Masterworks M-8608 8-track cartridge player. I couldn't ever find any schematics on this unit unfortunately. There's these little 2-leg purple disk things on the main circuit board and I'm trying to figure out what the heck they are. I'd replace them if they're bad, but...

New to Schottky diodes. From reading, I gather they are low-forward-voltage, fast switching diodes, with more reverse leakage than silicon diodes. Forward voltage drop (Vf) should be around 0.35V, and they should block in reverse. There's a plethora of info online but I haven't come across a...

I'm looking to do the mod on my Dynaco ST-70 that puts diodes in front of the rectifier tube. I see a big pack of appropriate ones on Amazon for less than $10. Are there a lot of differences between diode brands, as with caps, or are they all similar enough to use whatever is cheap and...

Greetings all, I'm starting to post more on AK. It's fantastic that there are so many members that are willing to help newbies like myself. I've replaced all of the caps in the 551 with the exception of the tuner, which I will do once I've finished replacing the transistors (Pre-Power-phono) on...

Hi, im working on restoring a Sansui 1000a. Ive got the parts list together except i cant figure out what value i need to getnfor the rectifier diodes. Tried searching but came up empty. Any suggestions?

First of all let me explain my approach. I am a novice at making repairs, my electrical background is PLC controls so I understand what the parts are in the schematic. I can try to trouble shoot the circuits but I choose to replace all the parts when I identify a fault. I guess we could remove...

Hello and happy new year! I am working on a Marantz model 500 and there is a dead short FH1100 diode on one of the driver boards. Please can someone recommend a replacement available currently? Thank you!

Hey all, Usually, I post in the Marantz forum because I play with them mostly, but have begun to appreciate the Optonica from Sharp. I am trying to find either a replacement or substitute for the biasing diodes on an SM 4545. The parts list shows it as a VHVMV203Y/-1, don't know if that is a...

im repairing a Luxman L-210 that i picked up at a garage sale. turns out that one of the resistors and zener diodes shorted but when i looked up the parts list in the service manual it says "HZ22-2L Zener" for diode D-112 (number on the amp board). I've tried searching up the description and the...

hello. I’m sorry for dual posting my introduction and diode request a week or so ago. I’m not trying to cause any extra work on my behalf. I’m sorrry. I did get a whole lot more of a welcome than I ever expected. Thank you guys for that. Are there any 4H diodes for sale anymore? Im thinking...

Hi All, I need help with replacement for older diode in a circa 1980s amplifier. A few of the diodes leg was badly corroded (one is broken upon cleaning) by glue from nearby elco. I'm hoping to find a similar spec new replacement. Hitachi/Renesas HZ12-A2 -AX in regulator section Possible...

I have a nicely working fisher 70rt but I’m concerned about the selenium rectifier overheating. It plays fine so don’t want to mess with it if I don’t have to. I’ve replaced a selenium rectifier in a Dumont am fm tabletop radio with great success. However looking at the diagram for the fisher -...

I've been working on this Project One Mark IIIB for weeks now (on and off). Long story short, the protection relay activates on the right channel - mid volume - with or without a load. I have isolated the preamp/amp, swapped amp boards and outputs (left to right), replaced all transistors, all...

I'm recapping the power supply board on my 6300. Also replacing the Diodes and transistors. There are two diodes (looks like the rectifier) that I can't find any replacement for. They are: H801 - CO8P2N and H802 - CO8P2R Can anyone Help with suggestions? Thanks you

Hey Ak I'm restoring my Acurus A250 and at the same time making some mods, this includes new starground curciut. I'm splitting input and feedbackground (now they share same ground at input), but what about D3/D6...??? I parallel a 4,7uf/470nf cap over these for lower noise, but should I also...

I'm in the process of taking apart my Akai deck to recap and replace some diodes. The ones I'm focusing on are on the main control board since those caps appear to be the leakiest...however, my multimeter doesn't have a function to test diodes and I can't tell what their values are because the...

Been working on a basket case Pioneer A-80 for a while. One amp board and outputs were completely trashed. Replaced the obvious and then tracked down a few more severely out of tolerance resistors. That channel is working just fine and begins clipping at 223wpc using direct mode, 1000hz signal...

Hello, I have been trying to recap a 1060 and have made excellent progress as the unit sounds very good now as opposed to when I got it. My question .... I am pretty sure someone has been in here before as the outputs appear to have fresh heat sink compound on them and they are Hitachi and not...

Hello, I posted in parts, but thought a Marantz junkie might have one of these, or an scrap unit with them still in place. Need at least one. Help please! Thanks Rich