Tech Help pleasefor this PA amp Conversion

[jerryjg]

[IMG]HI. Can anyone help me with some tech advice. I have a friend who is going to help me convert a Tube PA to a guitar amp. It is a Lafayette model PA 675(a).We dont necessaraly need a schemetic, however my friend isnt certain about the Power tube configuration. There are 3 sockets , two of them are marked EL34. The third on the end in the pics,wothout any resistors tied to the socket is unmarked, and has seperate taps from the the EL34's directly out of the transformer. This doesnt appear to be a power tube, according to him. He cannot figure out waht it may be. It is definitly a socket similar to the two marked el 34 with seperate Power tansformer taps. Ant help on this would be really appreciated. I think an EL34 PA amp would make a really greta Guitar amp conversion, but we have reached an imp[asse with no available schematics. Ive searched just about everywhere. here are the pics....http://i111.photobucket.com/albums/n.../jerr218-1.jpg
[IMG]http://i111.photobucket.com/albums/n134/****dog1/jerr218-1.jpg http://i111.photobucket.com/albums/n...g1/jerr218.jpg http://i111.photobucket.com/albums/n...g1/jerr219.jpg http://i111.photobucket.com/albums/n134/****dog1/jerr220.jpg[/IMG]
HI. Can anyone help me with some tech advice. I have a friend who is going to help me convert a Tube PA to a guitar amp. It is a Lafayette model PA 675(a).We dont necessaraly need a schemetic, however my friend isnt certain about the Power tube configuration. There are 3 sockets , two of them are marked EL34. The third on the end in the pics,wothout any resistors tied to the socket is unmarked, and has seperate taps from the the EL34's directly out of the transformer. This doesnt appear to be a power tube, according to him. He cannot figure out waht it may be. It is definitly a socket similar to the two marked el 34 with seperate Power tansformer taps. Any help on this would be really appreciated. I think an EL34 PA amp would make a really great Guitar amp conversion, but we have reached an impasse with no available schematics. Ive searched just about everywhere. Here a]

[SlyFoxx]

Re: Tech Help pleasefor this PA amp Conversion

Maybe a rectifier tube? Is it the first tube from either side closest to where the wall current enters the amp?

btw that's a nice avatar but she needs fewer cloths!

[Rich_S]

Re: Tech Help pleasefor this PA amp Conversion

I can't see your pictures, but if the power transformer is connected to the socket, it's almost surely for a rectifier tube. It isn't labelled with a tube number? With two EL34's and a tube recto, it sounds like it would make a great JTM45 or Bluesbreaker.

On the other hand, are you sure they're marked EL34 (big, octal sockets)? Two EL34's in an American PA amp would be kind of rare. Or, are they EL84's with small 9-pin sockets? Is the output power marked on the speaker terminals?

Check out my website (link in my signature) - I'm a PA-amp-convertin' fool, too. PM if you have any more questions, or e-mail the pics.

Also, I've found that the critical mass of PA-amp-converters seem to hang out at Doug Hoffman's web forum. You might want to post there about this kind or stuff. Welcome to a weird, fun hobby.