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In the Forum: Audio Discussions
In the Thread: Are Any Powerful Amps Worth Using?
Post Subject: A set with paralleled GM-70Posted by Romy the Cat on: 1/27/2012
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An interesting amp, thanks, decoud.

http://www.sacthailand.com/AmpGlowMasterGM70.html

I never have seen or hear it but it might be interesting. Chinese makes nowadays a lot of pretentious high-end products and they are mostly horrible crap. Here is Thailand put itself in the map. It also might be a “horrible crap” but it very much might be a perfectly viable amplifier. It is all depend from what in the head of the guy who make them in Thailand and sine we have absolutely no idea who he is and what he is it is hard to say anything.
Let to see some circumstantial evidences that he can get. The amount of distortions he promises is believable. The response at 60W is very reasonable as well; even I would like to see it not at 60W but at full 70W rated power.

The input tube, the Russian 6N1P is garbage tube; very bad sounding and it certainly need to be replaced with something different. Thankfully there are plenty of similar tubes and it might be an hour-long job to fit the amp with some kind of better sounding tube with similar characteristics.
My main question in this amp would be the 6BL7 driver that pushed the output stage. The guys who make the amp are very diplomatically provided response at 60W but they did not stress it further. To me, the key to thinking about this power amp will be to see what this amp does at 75W, I want to see HOW it clips. Will it be the driver? The 6BL7 is 10W on plate, usually 8W, so it will be 16W driving a pair of GM-70. It is a bit not enough current. Since GM-70 is DHT and can easily run on the negative side of the curve then I would like the driver be able to handle the GM-70’s grid current if called upon it. I think that two plates of 6BL7 is a bit shallow buffer. After all the purpose of the amp like this to driver non-sensitive load and to throw power….  So, as clipping will take play on the amp I would like to see what kind clipping will it be and will be and the most important what element will clip first: drives, PS, transformer, etc….

Somebody need to make own business to scavenger Far East, to collect those amps and to bring them to US. During the last 20 years there were a number of reps who did very good living by importing European amps to US, I do not see why nowadays the right people do not do it with Asian products.

Tne Cat

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