What Pass Labs amp is this?

[jencelo]

I am NOT a DIYer so it may be a stupid question. The seller doesn’t know what amp this but he says it is supposed to be a Pass Labs circuit. He bought it from someone.

Can you tell what model it is? And how well/cleaned it is made? Looks neat to me.

This is also what he mentions about the specs but I don’t know how accurate it is.

Very nice sounding 30wpc class Internal working voltage: two groups of independent double 35V DC



Pure Class A output power:

26W*2 8 ohm speaker

30W*2 4 ohm speaker



SNR: 108db

 

[Dennis Hui]

I'm going to guess it's a small Aleph. If you can take some close up photos of the circuit board people are have a better look.

 

[jencelo]

Yeah, I guess I will ask him. This is the only one he has posted.

 

[needtubes]

Looks like each channel has three electrolytic capacitors, three TO-220 transistors, and a TO-92 transistor, so that definitely suggests an Aleph circuit. Only two TO-247 devices per channel, so it must be essentially an Aleph-mini with higher rails and bias.

 

[moe29]

The Mini-A, another Grey Rollins hi-fi adventure. 🙂

Written 22 years a go!!! 😱🙂

 

[jencelo]

I decided to do a Google Lens search and this came up! This is the SAME amp. Funny thing is the asking price is $10 more that his used amp!
What is A30? Aleph 30?

https://www.ebay.com/itm/1649077433...W4zxZ9QRee&var=&widget_ver=artemis&media=COPY

 

[needtubes]

Yes, A30 would likely be interpreted as Aleph 30 in this context. But, there are some key differences between this amp and a true Aleph 30. For one, the Aleph 30 had more output pairs (6 pairs in total, if I remember correctly) instead of a single pair per channel. Also, an Aleph 30 would power double into 4-ohms. The lack of additional power into 4-ohms for this amp could be caused by lower overall bias (being limited by the single output pair) or a different current gain setting (or both).

This isn't too say it's a bad amplifier, just not really a true Aleph 30.