little-al
Active Member
The attached schematics and parts list have been posted in another thread some time ago, but I thought I'd post them again to reference for asking a specific question about the three versions of the Fisher 30-A.
That question is especially relevant when noting the differences in capacitor values chosen for the 10000 series as compared with the 20000 and 30000 series 30-A amplifiers.
I am wondering if one can tell or estimate what the impact is to frequency response, or any other performance measure, for the 10000 series as compared to the later two series.
You will note specifically the difference in value (.022 versus .047uF for example) in the C1, C2, C6 and C8 capacitors between the three different serial number series.
It's also interesting to note that the 10000 series seems to have at least one additional capacitor, C4, and the 30000 series has an additional or reconfigured resistor, R16/R10.
Is one design better than the other? Would they perform differently?
I have the 10000 series, with the single 2.5Ohm output transformer and the values in the spec match with what I have in mine.
Thanks,
Al
That question is especially relevant when noting the differences in capacitor values chosen for the 10000 series as compared with the 20000 and 30000 series 30-A amplifiers.
I am wondering if one can tell or estimate what the impact is to frequency response, or any other performance measure, for the 10000 series as compared to the later two series.
You will note specifically the difference in value (.022 versus .047uF for example) in the C1, C2, C6 and C8 capacitors between the three different serial number series.
It's also interesting to note that the 10000 series seems to have at least one additional capacitor, C4, and the 30000 series has an additional or reconfigured resistor, R16/R10.
Is one design better than the other? Would they perform differently?
I have the 10000 series, with the single 2.5Ohm output transformer and the values in the spec match with what I have in mine.
Thanks,
Al
Attachments
Last edited: