bricktop
Couch woofer
Converting a Bogen MO-200A into something useful...
I got a beat-up bogen a while ago for $60 from a friend (which he got from Douglas). Finally got around to rebuilding it. I know there are a bunch of these things around, so I'm posting my refurb here for anyone that wants to a refurb on theirs, or just people who like tube eye candy . I'm just posting now because I hope to get it up and running soon. Sometimes they pop up on that auction site here and there.
Amp specs:
plate voltage: 680 VDC
Screen voltage: 340 VDC
Power tubes: originally 8x 8417, converted to 8x JJ E34L
class: little AB, mostly B
power output: transformers are good for 100W each 20Hz-50KHz from what I gather here: http://www.montagar.com/~patj/bogenspecs.htm, but I'll see what it actually does soon.
drivers: originally two 7247s, now 4x 6CL6 LTP w/CCS
I took some pics here of the chassis and fit-testing the caps. I like how they go in here, pretty proud-a that since you can't see the clamps from the top. I'm gonna go with the blumlien cathode bias scheme so there will be no bias potentiometers to adjust. thanks for the suggestion Douglas.:thmbsp:
The little spots of gray on the chassis is JB weld that I used to fill in the old holes...seems to work well and paint goes over it nicely. Anyways, Happy Holidays everyone. This will probly be one of last posts before Christmas b/c I'll be going home where there is only dial-up, and that connection just makes me mad so I don't use it:sigh:
bye yall'
I got a beat-up bogen a while ago for $60 from a friend (which he got from Douglas). Finally got around to rebuilding it. I know there are a bunch of these things around, so I'm posting my refurb here for anyone that wants to a refurb on theirs, or just people who like tube eye candy . I'm just posting now because I hope to get it up and running soon. Sometimes they pop up on that auction site here and there.
Amp specs:
plate voltage: 680 VDC
Screen voltage: 340 VDC
Power tubes: originally 8x 8417, converted to 8x JJ E34L
class: little AB, mostly B
power output: transformers are good for 100W each 20Hz-50KHz from what I gather here: http://www.montagar.com/~patj/bogenspecs.htm, but I'll see what it actually does soon.
drivers: originally two 7247s, now 4x 6CL6 LTP w/CCS
I took some pics here of the chassis and fit-testing the caps. I like how they go in here, pretty proud-a that since you can't see the clamps from the top. I'm gonna go with the blumlien cathode bias scheme so there will be no bias potentiometers to adjust. thanks for the suggestion Douglas.:thmbsp:
The little spots of gray on the chassis is JB weld that I used to fill in the old holes...seems to work well and paint goes over it nicely. Anyways, Happy Holidays everyone. This will probly be one of last posts before Christmas b/c I'll be going home where there is only dial-up, and that connection just makes me mad so I don't use it:sigh:
bye yall'