Class A mosfet idle issue

[Zen Mod]

sorry - I recently made major cleaning of my workshop , but I didn't found that envelope

[sakis]

thanks fro trying zen ...

will keep it as is and will see

[jacco vermeulen]

Take the basic Hitachi note, then add plastic MOSFETs and the typical British minimalistic approach.
Bias it to a few watts in Class A, name it MF something as usual for Englanski products and offer it for a Japanese retail price.

Many years later you expect a miracle to happen ?

[sakis]

hello Jacco ... good to talk to you from time to time since it reminds of the wonderfull Dutch food ( or wonderfully stollen from the indonesian but it doenst matter does it ?? )

yes ...i find your approach very realistic personally i wouldnt mind to burn 250Wof power per chanel if it sounded better than my P3A ... but actually it doesnt ... so i dont bother i will have to limmit the operation only to biass it enough to be stable and thats it

thanks

[sakis]

by the way all the efoort i made to locate some web or phone to talk with the company ended up in a total zero

[sakis]

any body in for a joke ?????

the bias issue was fixed since secondary power supply that feeds the first stages of the amlifier was a mess but not 100%

the problem seemed to stabilize but not solved idoubled checked everything but it was impossible to find something wrong

to refresh the problem that if you install an A meter in the rails to monitor bias and set it up to 800ma for example ...eventhough the bias is stable voltage drop on the source resistors is much diferent from channel A to chanel B

just noticed ...source resistors in channel A are 0R22 and in channel B 0R33

this also is factory mistake ...the amplifier was never opened before somebody in this company was colour blinde

[jacco vermeulen]

Originally Posted by sakis

but it doenst matter does it ??

Lack of QC appears typical for a number of GB products of that era.

The whole idea of stealing is that it is something wonderfull, or one would be better off with the local horrible food.
Sakis, every time i talk to you i'm reminded that some folks are 500 yards away from having snacks and ouzo at a sunny marina.
Moi, i still have to rely on invites for airconditioned coffee with the doors closed.
Shots of the latest aircon one i visited a few weeks ago, the 50m Sky, the yard uses the marina overhere as a docking during sea trials.