Hi
I'm putting together a parts order for a power supply which is going to be used for a clone of the Mesa/Boogie Bass 400 guitar preamp section only:
Pre and power amp schematic
PSU schematic
DIYaudio user zafira1981 has re-drawn the schematic here.
A few questions:
1. On the original service schematic, there appears to be a bank of caps (marked "220uf 300VDC TEN TOTAL") - can anyone suggest a cheap UK source for a suitable batch of caps, perhaps new old stock? Farnell price would be £20+ for these so it may be possible to save a bit of money if someone can suggest an alternative supplier.
2. What spec does the filter choke need to be? The original schematic seems to say "ORG"?
3. Some of the capacitor sizes seem very difficult to find. Would the following replacements be suitable?
- instead of the 40uF caps after the choke, how about 47uF/400V.
- instead of the 30/500 on the final RC, would 33uF/450V be sufficient?
4. I'm having difficulty sourcing a 220-0-220 transformer (240V primary). Power rating only needs to be enough for 2x 12AX7 since it won't be running the 6L6 as in the original Bass 400. Any suggestions?
Any help is much appreciated.
Greg
I'm putting together a parts order for a power supply which is going to be used for a clone of the Mesa/Boogie Bass 400 guitar preamp section only:
Pre and power amp schematic
PSU schematic
DIYaudio user zafira1981 has re-drawn the schematic here.
A few questions:
1. On the original service schematic, there appears to be a bank of caps (marked "220uf 300VDC TEN TOTAL") - can anyone suggest a cheap UK source for a suitable batch of caps, perhaps new old stock? Farnell price would be £20+ for these so it may be possible to save a bit of money if someone can suggest an alternative supplier.
2. What spec does the filter choke need to be? The original schematic seems to say "ORG"?
3. Some of the capacitor sizes seem very difficult to find. Would the following replacements be suitable?
- instead of the 40uF caps after the choke, how about 47uF/400V.
- instead of the 30/500 on the final RC, would 33uF/450V be sufficient?
4. I'm having difficulty sourcing a 220-0-220 transformer (240V primary). Power rating only needs to be enough for 2x 12AX7 since it won't be running the 6L6 as in the original Bass 400. Any suggestions?
Any help is much appreciated.
Greg
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