Worn Parts Or Hidden Rumble Filtering?

[NoTransistors]

I did not know how deficient in bass my Fisher X-202-B was, until I began using my Sansui QR-6500. The only source I listen to is VINYL.
I just tried something. Both units have jumpers to separate amp from pre-amp. The turntable is now playing through the Sansui pre-amp and the Fisher's power-amp. Sounds much better. Did I say it sounds much better?
Sound has more focus, and almost as much bass as with the Sansui amp section.
So the question is-Where is the problem? Are there hidden filters in the Fisher front-end? Can the 'I.C.'s that are used for the RIAA curve stand an improvement, by making them over on a bread-board, as some have done?
Should values be changed?
What say you?

Seth
Forever Analog and Covered In Parrot Poop

[NoTransistors]

Nothing from the Peanut Gallery?

Seth
Forever Analog and Covered In Parrot Poop

[vinyldavid]

It could be that something in the power supply was intentionally done that way, as it might have come from a console.

I vaguely remember reading something about it, nut have no idea where I could find that theread. it was about Scott equipment, I think.

[NoTransistors]

I know what you are referring to. Console amps sometimes had low-frequency filtering to hide t.t. rumble.
This unit was purchased by my uncle as a separate.
I had a Scott LK-72B that benefitted from changing values of many coupling caps. Much more bass. The original cap values were chosen to remove rumble as well as that last octave of bass.

Seth
Forever Analog and Covered In Parrot Poop