...And I'm thinking it'd be fun to convert it into something guitar/bass amp-like.
The beast in question is this:
http://i153.photobucket.com/albums/s222/ac1176/Valvethingy1.jpg
http://i153.photobucket.com/albums/s222/ac1176/ValveThingy2.jpg
http://i153.photobucket.com/albums/s222/ac1176/Valvethingy3.jpg
It was a power amp used to test turbine governors at power stations, but now it's been saved from certain death during one of our cleanouts at work. When I first saw the size of those transformers I was thinking perhaps Ampeg SVT clone, but I think the output transformer is probably only rated for 100W or so. This thing is fecking heavy!
Without pulling it apart, I've established the following:
* 4x 6J5 triodes in the preamp, 2x 807's in the power amp
* Output transformer is unbranded, but judging by the appearance and from things I've seen previously, I'd say it's probably an old Australian-made A&R tranny. No markings on it except for "OPM21A" and "12-70". Haven't measured the ratios yet. From the labelling on the side the output terminals are 4 equal-ratio windings capable of delivering 50V @ 0.4A each. Windings can be series or parallel-connected.
* Power tranny (the massive black box) also has no brandname, badge has fallen off. Looks epoxy-encased or something - haven't seen that before. Only labelling is "PT6501". Secondaries are 500-0-500, 250-0-250, 0-10, and 3x 6.3V @ 1.5A, plus electrostatic screen connection.
* Measured the HT voltage and got 650VDC.
So, any suggestions as to what to turn it into? I'm probably not interested in keeping the 807's and I'd much rather use something a little more easy-to-get (hint - I've got loads of 7581A's that I could use :wink: )
The beast in question is this:
http://i153.photobucket.com/albums/s222/ac1176/Valvethingy1.jpg
http://i153.photobucket.com/albums/s222/ac1176/ValveThingy2.jpg
http://i153.photobucket.com/albums/s222/ac1176/Valvethingy3.jpg
It was a power amp used to test turbine governors at power stations, but now it's been saved from certain death during one of our cleanouts at work. When I first saw the size of those transformers I was thinking perhaps Ampeg SVT clone, but I think the output transformer is probably only rated for 100W or so. This thing is fecking heavy!
Without pulling it apart, I've established the following:
* 4x 6J5 triodes in the preamp, 2x 807's in the power amp
* Output transformer is unbranded, but judging by the appearance and from things I've seen previously, I'd say it's probably an old Australian-made A&R tranny. No markings on it except for "OPM21A" and "12-70". Haven't measured the ratios yet. From the labelling on the side the output terminals are 4 equal-ratio windings capable of delivering 50V @ 0.4A each. Windings can be series or parallel-connected.
* Power tranny (the massive black box) also has no brandname, badge has fallen off. Looks epoxy-encased or something - haven't seen that before. Only labelling is "PT6501". Secondaries are 500-0-500, 250-0-250, 0-10, and 3x 6.3V @ 1.5A, plus electrostatic screen connection.
* Measured the HT voltage and got 650VDC.
So, any suggestions as to what to turn it into? I'm probably not interested in keeping the 807's and I'd much rather use something a little more easy-to-get (hint - I've got loads of 7581A's that I could use :wink: )