Spent all most every night for a week on this, but I think the result is worth it.
I replaced all the electrolytic Caps all the pots and all the jacks. plus the knobs power light and fuse holder.
but now it rocks, where as before it was snap crackle and pop😀.
the origin's of this amp board are lost in time. but who ever made it sure new what they was doin' it's not a straight fender copy. even if it looks like one.
just the oscillator valve for the tremolo to reconnect then back in its case, rdy for march 1st gig.🙂
I'm just soo dmn happy I had to tell sum one lol.
I replaced all the electrolytic Caps all the pots and all the jacks. plus the knobs power light and fuse holder.
but now it rocks, where as before it was snap crackle and pop😀.
the origin's of this amp board are lost in time. but who ever made it sure new what they was doin' it's not a straight fender copy. even if it looks like one.
just the oscillator valve for the tremolo to reconnect then back in its case, rdy for march 1st gig.🙂
I'm just soo dmn happy I had to tell sum one lol.
Attachments
Cool Beans 😎
Hard to tell from pics but did you have to flip the board over to replace the components? Or did you tie on to the existing leads of removed components?
Nothing like doing your own work to an amp and hearing the end result!
Hard to tell from pics but did you have to flip the board over to replace the components? Or did you tie on to the existing leads of removed components?
Nothing like doing your own work to an amp and hearing the end result!
Looks great! Which preamp tubes are used in there??? The heater wiring to those tubes seem strange to me 😕
In what way?, nicely twisted wires running in the corner of the chassis away from the rest of the electronics.
The 'strange' thing to me is the perfboard, presumably it's a home made amp not a commercial one?.
No no didn't mean to say strange. I saw that the two triodes are wired in series at 12.6V. Had never seen that before in a guitar amp. Even better, as it would be less prone to noise issues.
The perfboard is strange indeed!! I also think it must be a home made amp, anyway it looks great with all these mustards 🙂
The perfboard is strange indeed!! I also think it must be a home made amp, anyway it looks great with all these mustards 🙂
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Assuming all the valves (other than the outputs) are double-triodes, then it's simple enough to wire them for 12.6V, and wire the output pair in series to give 12.6V as well.
Presumably it's down to the specific transformer that happened to be to hand? 😀
Yes, I've never seen perfboard used commercially, while for guitar amps tag-boards and tag-strips were the normal method of construction, makes you wonder why whoever made it didn't go that route?.
I suspect, just as they 'happened to have' a 12.6V transformer, they also 'happened to have' perfboard, but not tag-board or tag strip 😀
I've even repaired colour TV's made on tag-strip 😱 The long defunkt UK (American owned) manufacturer KB (Kolster-Brandes) made hand wired colour TV's (as well as B&W) with no PCB's.
My theory
Front and back plates of amp are commercial but as you can see un stamped with ether serial number or watts. So i think ether this was a prototype or built by sumone who worked in the Jansen factory ( Beverly Bruce and Goldie ltd). and yes the power trany has two heater circuits (this had me confused for a while too).
valve complement at present till i can afford sum new ones, (I'm real short on 12ax7s at the moment)
preamp channel one EH 12ax7 (that came my first Chinese 5E3 kit set), bass channel is a brand new JJ 803s (12ax7 long plate), and a Ruby 12ax7 hg in the Pi, (pi in this amp is like a 5E3 adds gain as well as in version). and 2 old stock RCA 6l6gc,s in the finals (these came in this amp when i bout it 13 years ago).
end result a high G will pin the needle of my 50watt watt meter hard over, wile an open E is about 18 watts.😀
Front and back plates of amp are commercial but as you can see un stamped with ether serial number or watts. So i think ether this was a prototype or built by sumone who worked in the Jansen factory ( Beverly Bruce and Goldie ltd). and yes the power trany has two heater circuits (this had me confused for a while too).
valve complement at present till i can afford sum new ones, (I'm real short on 12ax7s at the moment)
preamp channel one EH 12ax7 (that came my first Chinese 5E3 kit set), bass channel is a brand new JJ 803s (12ax7 long plate), and a Ruby 12ax7 hg in the Pi, (pi in this amp is like a 5E3 adds gain as well as in version). and 2 old stock RCA 6l6gc,s in the finals (these came in this amp when i bout it 13 years ago).
end result a high G will pin the needle of my 50watt watt meter hard over, wile an open E is about 18 watts.😀
Attachments
Oh an yes I had to take the Board out to do the soldering and I managed to map most of the circit as a .sch ( see the post "jez I hate bread board", that's what we call perf here) but in the end i got kinda lost round the Pi and term circuits. The tremolo still dosn't work, but who needs it on a bass anyway?
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