SET Asylum

Posted by Thorsten (M) on July 26, 2005 at 11:35:08

In Reply to: Sun Audio posted by Sr5 on July 26, 2005 at 10:32:40:

Hi,

> The Sun kit was inexpensive, but took some changes.
> Gridchokes and changing coupling value helped alot.
> Still not in the same league as 10 driving 10 IT coupled

I would not think it would able to match that. There are some Issues I take with the Sun VT-25 Amplifier. With an HT of barely 350V or so it really needs more +B (around 460V are needed) or current must be increased, which would be beneficial IMHO as the Output transformer in that Amp could use both more inductance and impedance.

The Driverstage could also use some tyding up....

Still, gridchokes are good for the 10Y as it actually remains fairly high input impedance for Class A2, but still grid current rectification will throw the anode current off and with that already being low there is just not enough power.

If you would like to tinker a bit further and see how far that VT25 lark can go drop a line outside thf forum (maybe on DJ's Yahoo Group?).

Ciao T