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Re: I can send a pic of guts (just opened up)

Posted by Thorsten (M) on December 18, 2004 at 11:12:29

In Reply to: Re: I can send a pic of guts (just opened up) posted by dozer on December 18, 2004 at 10:43:28:

Hi,

It did not work because you did not follow my instructions which line to copy. The right way gives the result below.

Some basic comments on this.

In one picture we see a 100uF/250V capacitor touching a power resistor (680R) which is likely the cathode RC combo of the Amplifier. The Resistor will get quite hot in operation (especially being only a 15W type and with no heatsink or other cooling) and will heat up the capacitor, reducing significantly the lifespan. Once that capacitor shorts out it's usually also good buy 300B.

The use of 680R for the cathode resistor is worrying too, it will result most likely in rather higher than specified current through the 300B, leading to a fairly quick aging of the Output valve (it does provide more power though than traditional operating conditions).

This capacitor and another one also look ill fitted inside, as if the designed called for something smaller in size which they run out of.

In the big powersupply the torroidal transformer touches one of the main powersupply capacitors. This power transformer most likely will run pretty hot, the result will be premature aging of the capacitor, I'm pretty sure the other capacitor will also get quite hot.

Component quality is pretty average, with the possible exception that a "audiophile brand" Auricap is used as one of the (aparently) two coupling capacitors, I don't personally think much of them and better options actually exist, at ant extent, the second coupling capacitor appears to be generic chinese MKP, the rest of circuit and components appear generic.

The assembly quality and general design still leave questions (especially the excessive cramping of hot circuitry which cannot be considered a good thing as it cuts down the lifeexpectance of the relevant compoinentry drastically), the assebly appears a little above the standards of what I have previosuly seen by dared, at least they somehow managed to fit all capaictors instead of placing the off-board with long wirs and stuck down with hot melt glue.

I would make sure that you know who will repair the Amp's when (not if) some of those capaitors throw in the towel.

Ciao T

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