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Apologies for resurrecting this old topic. I added a beautiful T2 to my collection, and it had a problem. The volume was low, and uneven between channels. The culprits, TR413 and 413, 2sk68a. Both measure as a resistance. The idss in this case is not very critical, so I decided to use some...

Remenber to clean the stereo/mono selector.

I think I have some originals "in stock"

Wow, sorry to hear that. Thank goodness it is in good hands. ;)

I use Wakefield-Vette thermal compound

There are counterfeits that can work more or less well, but they usually have a smaller die than the original, and they can fail under load. I would do some testing increasing the load gradually.

I used wide dispersion LEDs (140º), Kingbright brand. Right now I don't remember the reference, I think they are already discontinued. Once the mod that @Nashou66 remarks is made, you simply have to replace each bulb with an LED + a series resistor. As you probably already know, the function of...

You could also add an external protection, between the amplifier and the speakers. But I like it integrated, and it's a reversible mod.

Yes. There is also a BOM posted in case you need it.

This amplifier does not have speaker protection in case of failure. Keep that in mind. I have a post somewhere on how to add it.

Hello, and welcome aboard! That resistor is not OEM, someone added it. I would remove it.

C528 did not exist on my unit..

toluene is a very good glue remover.

I have this

Yes, OEM solutions are not always optimal. But in the case of mica or thermal pads, I usually respect it. It's just personal preference...

No, I haven't had bad experiences. It's personal preference. I usually always put what the manufacturer used, so it has an OEM look. There are thermal pads with very good characteristics, you will not have any problems.

Good job. IMHO, I would use a good quality thermal compound with mica, and not thermal pads.

I have bought one recently. It is in very good condition. I had to clean the famous glue, and replace a couple of capacitors with corrosion on the legs. Change thermal grease, readjust and little else. This preamplifier works quite hot, so it will need more or less work depending on the use it...

You won't have any problem

You have to clean up the Sony Bond glue, it causes malfunctions

rectifier, sorry

In any case, once disconnected from the DBT, the bias current must be checked and readjusted if necessary.

You will need to use at least one rectifying diode, or the reverse voltage will mess up the leds.

Start by measuring voltage on the transformer, then resistors, and push button. There isn't much else...

Something to consider is the airflow, static pressue and working conditions. In case of PA amplifiers, it's common for them to be installed in cabinets with little space for airflow, therefore noisy fans are used that can work with higher static pressure and have a greater no-load airflow...