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That charring is due to a bad solder connection on the collector connection of that transistor socket.

I work on C-4's and C-70's the most.. Recommend you think about the SW503 Upgraded switch. :thumbsup: SW503 quite frequently fouls a slide switch contact. Resulting in channel drop outs when switching from TONE OFF/ON. It is a solenoid operated slide switch. With 8 tiny slides. To do it...

-2.7mv is a better number than + 7mv ... It's a lot closer to zero than 7mv is. Ideal voltage on the ( O ) output is zero volts.

Welcome aboard.. Sorry for your loss..

Using 6 Ω speakers in bridged mode the M-4 amplifiers will see a 3 Ω load. So.... If the speakers drop to a 4Ω load. The amplifiers will see a 2Ω load. Flirting with disaster.. I would be finding some 8 Ω speakers..

https://akdatabase.com/AKview/albums/userpics/10007/Yamaha%20HP-1%20Service%20Manual.pdf HFE or Elektrotanya may have a owners manual posted.

Happy Birthday Simi..

Not necessarily a bad thing. Those are 2 watt resistors for a reason.

What is your location ?

RY504 ----> small yellowish /orange relay.. Or a bad solder connection on the same relay and/or the RCA jack for the inverted output. When I refurb these pieces . I replace all eight of these HB2E relays with new pieces. Try tapping on that relay ( RY504 ) to see it the missing channel...

Voltage regulator circuit for the MM phono pre-amp.

Recommend you get a good H-Q service manual. They don't get any better than this.. This is the manual I'm using.. https://www.analogalley.com/osccart/product_info.php?manufacturers_id=55&products_id=2657&osCsid=87904abb7deb479f8022263fc89039d7 The free scans online all suck really bad.

I replace all the parts with corroded leads -- to include jumper wires , resistors ,capacitors , diodes etc.

D127 zener diode HZ 27 same as the zener diode right beside it D126 .8 Watt 27v zener diode https://www.mouser.com/ProductDetail/onsemi-Fairchild/1N4750A-T50A?qs=0lQeLiL1qyZTeSFGUVFlrA%3D%3D

Soften up the stubborn bits with either isopropyl or acetone on a Q-tip.

I use and narrow exacto - chisel blade to chip off the bulk of it.

Have fun.... :biggrin:

Thoroughly remove the glue and inspect the leads to the components that were in direct contact with the glue for oxidation/corrosion.

As Nashou said.. That is old glue holding that braided nylon sleeve around transistors. The glue has possibly corroded the transistor leads..

I used a milling machine. :thumbsup:

You will find Delrin difficult when trying to cinch down the binding posts. Especially with the cheap Chinese posts.

I use it for Yamaha binding posts. Machines nice and clean. :thumbsup:

McMaster - carr------> garolite ( a black type of phenolic )

Welcome aboard Alejandro

Welcome aboard. For FM most likely yes and external antenna is required... For AM depending on distance away from AM station . And AM loop antenna. Something like this...