I watched your three parts and I can say really well done! I love seeing those old amps working like a charm again and you did a great job! I do have some questions: What is your experience with the thermal paste under the power transistors? Normally this should not dry out as it usually consists of a type of silicone oil. However, I've also had amplifiers on the table where the thermal paste was completely dried out, and since then I've checked this with every device and replaced it. I have also experienced that a difference in the output level of the two channels was due to a very dirty volume potentiometer. This was the reason why audio came out on both channels but at completely different levels. Was very weird cause for the most part I couldn't find it out the cause of this. Do you have any tips or videos on how to disassemble and clean those pots as gently as possible (perhaps an ultrasonic bath?) or are there suitable spare parts for this type. Thanks in advance!
Thanks! Yes, it's in general good practice to replace the thermal paste. I usually replace it but I didn't do it on this one. God knows why... I don't have any video yet showing how to open up modern potentiometers. You could check the TH-cam channel "Trevor's Bench". I've seen him do it a couple of times. Glad to hear you're enjoying my videos! Cheers.
Good job ! It works just fine on high frequencies. Can you, please, help me with one info: - There is a certain "monitor" button on Hitachi amplifiers or amp-receivers with "copy" 1-2 or 2-1 function. What os this and hiw does it work? Is it a bypass for copy between source 1 (record) to source 2 (tape) ? Signal is ajustabile on copy with amplifiers functions? Thank you in advance. Have a nice sunday afternoon!
Thanks! My Yamaha A-500 has that same function. It has inputs for 2 tape decks and that function is used for tape dubbing. It selects which deck is the source and which is the destination for the tape copy.
I watched your three parts and I can say really well done! I love seeing those old amps working like a charm again and you did a great job!
I do have some questions:
What is your experience with the thermal paste under the power transistors? Normally this should not dry out as it usually consists of a type of silicone oil. However, I've also had amplifiers on the table where the thermal paste was completely dried out, and since then I've checked this with every device and replaced it.
I have also experienced that a difference in the output level of the two channels was due to a very dirty volume potentiometer. This was the reason why audio came out on both channels but at completely different levels. Was very weird cause for the most part I couldn't find it out the cause of this. Do you have any tips or videos on how to disassemble and clean those pots as gently as possible (perhaps an ultrasonic bath?) or are there suitable spare parts for this type.
Thanks in advance!
Thanks!
Yes, it's in general good practice to replace the thermal paste. I usually replace it but I didn't do it on this one. God knows why...
I don't have any video yet showing how to open up modern potentiometers. You could check the TH-cam channel "Trevor's Bench". I've seen him do it a couple of times.
Glad to hear you're enjoying my videos! Cheers.
@@retro_techСкажите, это Ваш основной любимый усилитель ?)😊😊😊
Скажите, это Ваш основной усилитель ?😊
Good job !
It works just fine on high frequencies.
Can you, please, help me with one info:
- There is a certain "monitor" button on Hitachi amplifiers or amp-receivers with "copy" 1-2 or 2-1 function.
What os this and hiw does it work?
Is it a bypass for copy between source 1 (record) to source 2 (tape) ?
Signal is ajustabile on copy with amplifiers functions?
Thank you in advance.
Have a nice sunday afternoon!
Thanks!
My Yamaha A-500 has that same function. It has inputs for 2 tape decks and that function is used for tape dubbing. It selects which deck is the source and which is the destination for the tape copy.