Hughes & Kettner AS 64 schematic wanted

[walkman]

Recently I was given a Hughes and Kettner AS27 digitally programable guitar amplifier from 1984.

Apparently it is a prototype of their first model the AS 64 but lacks the midi control.
It has a clean channel and a tube channel with a 12AX7 at low voltage.
When I got it I was told that it was only making a very quiet sound. That wasn't exactly true as the clean channel is fricken loud and sounds just as good or better than any other good quality solid state amp I've heard. Only the tube channel is very quiet.

The circuit board has AS 64 printed on it so I'm chasing a schematic or some assistance debugging the tube channel.

[Enzo]

Well, don't ignore the step of contacting H&K directly and asking.

[walkman]

Yes I've contacted them and am still waiting....

[walkman]

Here are some pictures....

[walkman]

Eventually after putting the amp in storage for awhile, I emailed H&K again this time they sent me a circuit diagram. When I took another look at it I discovered fuse feeding the preamp tube that had blown. Now with it replaced the amp works great.

Sounds fantastic.

[musicfunkydude]

hughes kettner AS 64

Recently I was given a Hughes and Kettner AS27 digitally programable guitar amplifier from 1984.

Apparently it is a prototype of their first model the AS 64 but lacks the midi control.
It has a clean channel and a tube channel with a 12AX7 at low voltage.
When I got it I was told that it was only making a very quiet sound. That wasn't exactly true as the clean channel is fricken loud and sounds just as good or better than any other good quality solid state amp I've heard. Only the tube channel is very quiet.

The circuit board has AS 64 printed on it so I'm chasing a schematic or some assistance debugging the tube channel.

Hi mate was wondering if you could be a gentleman and help me out ? i just picked up an AS64 ,the output stage is in a bag !! need a copy of the circuit diagram can you help ? cheers George

[walkman]

will see if i can find it

[musicfunkydude]

AS 64 schematic

will see if i can find it

Thanks so much ,,,given up with H &K technical,,,got a mate who is a great techie for our local music shop but he insists on a schematic before he looks at it ,,cheers George

[rado90]

Hi

I have the same problem i have AM64 but AS64 have identical preamp section. If you find schematic could you send it to me too ?

[walkman]

Found it finally ...AS64_Servicemanual_1A.pdf