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VSSA Lateral MosFet Amplifier

2200µf 6,3v is found in the mounting note provided by LC.
I've seen recently that Mouser has re-stocked 1000µf 50V FG Cap, so both are now available, but now epcos (10µf 63v with 15mm and the right footprint is not that simple to find either) are no longer available. Shipping costs are likely to be greater than capacitors price... the whole cap set is available at digkey : one shot order, on shot shipping cost.

There is no MKT cap available at Mouser that fit the VSSA footprint...
This is what I bought, and what I paid (in the US):

Mouser:
(not that many in stock in the US btw)

UFG1H102MHM $1.95/1, $1.30/25 $1.17/100
UFG0J222MHM $1.38/1, $0.93/25 $0.853/100

Newark:

B32522C106K $3.93 ea, $3.77/100

Not sure what makes sense in the EU, probably one person in the EU has to volunteer to ship them to the others.
Otherwise, shipping costs using US mail small parcel is too high.
 
To put some real numbers on this, one set of caps weights about 4 ounces. To mail in a padded envelope to Europe by first class mail was around $10, so it is like raising the price by 60 cents per cap (looks like pic below).

To mail 8 sets in one package the same way, about $23 (I think), or equivalent to raising the cost per cap by only 20 cents, and the price per cap drops substantially because you are over the 25-piece break point.

If I were in Europe, what I would try to do is just get anywhere from 6 to 10 people to share the cost, as opposed to scrounging around for alternative parts or secondary markets.... How difficult can this be for people who build their own audio equipment, and solder parts the size of a grain of rice??? :rolleyes:
 

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I'm going to attempt one DMM adjusting operation today. :bomb: Lazy Cat, could you confirm acceptable ranges for current settings?

According to VSSA Installation instructions you measure/calibrate voltage drops on certain resistors:
- 120 mV voltage drop on 10 Ohm VAS emitter meaning 120 mA VAS bias current at cold start. If you will measure later at 45 °C it will rise to 160 mV i.e. 160 mA
- 4 V voltage drop on 22 Ohm/5 W rail serial dumping resistor (these two are used only in calibration phase) meaning complete VSSA current (all stages) is app. 182 mA (18-20 mA front-end + 162 mA output stage)
 
How many Ohms is this resistance from each pin to heatsink? From +/-rails (pin 1, pin 5) to heatsink resistance is rising (charging ELCOs), from pin 3 it is around 100 kOhm.

For proper working conditions heatsink must be on GND potential. That is achieved by bolts conduction at VAS transistors T5, T6 or, if these are isolated as per Grounding scheme, by wire from GND faston to metal case.