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Old 8th April 2014, 05:40 PM   #1
M Gregg is offline M Gregg  United Kingdom
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Default 813 and gm70

Can anyone,

give some idea of the difference in sound between the 813 and the GM70?

I know its a difficult question.

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Old 8th April 2014, 06:04 PM   #2
Koifarm is offline Koifarm  Netherlands
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Here is something more to read about it.

813 / GM70 amplifier with Bartolucci transformers
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Old 8th April 2014, 07:29 PM   #3
M Gregg is offline M Gregg  United Kingdom
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Thank's for the link,

What driver is the best?

This uses 826

Greenvalve Audio 826 LC GM70 Tube Amp - YouTube

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Old 8th April 2014, 07:45 PM   #4
Koifarm is offline Koifarm  Netherlands
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I use a 6n6p for my FU13(813), this must also function with the GM70.
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Old 8th April 2014, 07:54 PM   #5
M Gregg is offline M Gregg  United Kingdom
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Any thoughts on this?

813 SE triode amps

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Old 8th April 2014, 08:04 PM   #6
Koifarm is offline Koifarm  Netherlands
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Looks good and not that difficult to build.

This one i use(see photo) with modified driver( now 6n6p).
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Old 8th April 2014, 08:17 PM   #7
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Koifarm View Post
Looks good and not that difficult to build.

This one i use(see photo) with modified driver( now 6n6p).
Don't suppose you have a schematic?
Have you tried the 807?

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Old 8th April 2014, 08:22 PM   #8
M Gregg is offline M Gregg  United Kingdom
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What output Tx's are you using?

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Old 8th April 2014, 08:35 PM   #9
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Koifarm View Post
Looks good and not that difficult to build.

This one i use(see photo) with modified driver( now 6n6p).
NB its a nice build.
Is this your amp?

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Old 8th April 2014, 08:40 PM   #10
Koifarm is offline Koifarm  Netherlands
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I shall tomorrow look for the schematic.

The transformers came with the chinese amp. This amp was cheaper complete then building yourself. About €400,-. Just did some modifications.

Current building a GU81m amp wih the FU13 as driver.
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