Vamaha P2200 temperature

[paragon]

Hello,

Temperature off my P2200 is about 102°F without work. Is it ok ? Room Temparature is about 80°F.

Thanks, Eckhard

[Lee in Montreal]

Hello,

Temperature off my P2200 is about 102°F without work. Is it ok ? Room Temparature is about 80°F.

Thanks, Eckhard

I'm going to measure mine and let you know soon.

[paragon]

Thanks Lee.

[brutal]

Checked the DC bias?

[paragon]

No, Bias is not checked yet. Maybe there is a drift out of bias range ?
I will check the whole amp later because of hum on the right during the first 10 minutes after start. I will change the old capacitors also.

[brutal]

No, Bias is not checked yet. Maybe there is a drift out of bias range ?
I will check the whole amp later because of hum on the right during the first 10 minutes after start. I will change the old capacitors also.

Hum could certainly be dried up caps. Any thump at turn-on? That's indicative of too large a DC bias (idle current) or offset, which then may settle after the servo circuit in them stabilizes. I'm assuming they use the same/similar dc offset servo design as the later PC2002/M. There is an (nearly) unobtanium IC's in them that have a tendency to let things drift too much. As I recall, the guys over on AK have tried a few sources for them with little luck.

I've seen vague mention someone has also modified them with a speaker protection circuit (they do not have like the PC2002/M) and some "audiophile" mods, most likely just better caps and replacement films for small value lytics in the audio path. Great amps when they run right, which is most of the time as they're pretty tough.