pete1729
Super Member
UPDATE: Sucess! With complete can cap restuffing pics. Thanks to all!
I have this nifty little Bell 2521 mono receiver. I am about to burrow into it and give it some long overdue love. The tuner section works fine, however the 2 phono settings (RIAA and EUR curves) and the tape setting generate considerable noise and hum.
Referring to the schematic one notes first that C1 and C2 in the lower right corner are multi section can caps which ought to be replaced as a matter of course. Am I correct in calling these the "filter capacitors in the power supply"? These supply proper voltages to the various stages in the audio circuit, in this particular case 190v to the phono/tape preamp stage? I will be replacing all 4 sections of the one and the 3 sections of the other with individual capacitors of equal value with one exception being the 50µF/25v section of C1 ('c' with the triangle) which I will replace with a 39µF and a 10µF in parallel.
Looking at the audio circuit of the phono/tape preamp section the capacitors seem to have values noted in MMF. Am I correct in assuming that they are likely to be ceramic and therefore less likely to be in need of replacement? Once I get inside I will be able to figure out which are paper and which aren't. At any rate, the can caps and the 12AX7 in the phono section are being replaced straight away. Does any one want to lay odds that this will eliminate the cacophony in the phono section?
I have this nifty little Bell 2521 mono receiver. I am about to burrow into it and give it some long overdue love. The tuner section works fine, however the 2 phono settings (RIAA and EUR curves) and the tape setting generate considerable noise and hum.
Referring to the schematic one notes first that C1 and C2 in the lower right corner are multi section can caps which ought to be replaced as a matter of course. Am I correct in calling these the "filter capacitors in the power supply"? These supply proper voltages to the various stages in the audio circuit, in this particular case 190v to the phono/tape preamp stage? I will be replacing all 4 sections of the one and the 3 sections of the other with individual capacitors of equal value with one exception being the 50µF/25v section of C1 ('c' with the triangle) which I will replace with a 39µF and a 10µF in parallel.
Looking at the audio circuit of the phono/tape preamp section the capacitors seem to have values noted in MMF. Am I correct in assuming that they are likely to be ceramic and therefore less likely to be in need of replacement? Once I get inside I will be able to figure out which are paper and which aren't. At any rate, the can caps and the 12AX7 in the phono section are being replaced straight away. Does any one want to lay odds that this will eliminate the cacophony in the phono section?
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