I'm using the QUAD 520F Power Amplifier well.
However, unfortunately, Amplifier Power Supply parts is weaked. (Hum ??)
I want to replace weaked part.(I guess capacitor and transistor T100 ZTX 652, T101 ZTX 752)
But I have not weaked part's (transistor, because part's is obsolete)
Please let me know weaked part's changing. (another vendor of compatible part, transistor name)
However, unfortunately, Amplifier Power Supply parts is weaked. (Hum ??)
I want to replace weaked part.(I guess capacitor and transistor T100 ZTX 652, T101 ZTX 752)
But I have not weaked part's (transistor, because part's is obsolete)
Please let me know weaked part's changing. (another vendor of compatible part, transistor name)
The direct equivalents for those E-line types are ZTX653/753 which differ only in their higher voltage rating. There are no equivalents from other vendors but many other larger types will substitute. The function of these parts in the power supply is simply to maintain the HT+ HT- power supply voltages at close to equal voltage with respect to ground. If they have failed, the voltages will float unequally and they will have obvious internal shorts or open connections.
If you have hum, it is likely the capacitors C100, C101 are the problem, particularly if they are original parts.
If you have hum, it is likely the capacitors C100, C101 are the problem, particularly if they are original parts.
An externally hosted image should be here but it was not working when we last tested it.
While you are changing caps C9 and C11 the two decoupling caps might be worth replacing. T100/101 only produce the virtual 0V for the amplifier.
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