Bass leaves after amp warms up?

Hi Atmasphere:
I lost the bass yesterday after "looking" for it all day.
I turned off the amp as you said and shortly after it was back.
But there is no pattern yet..I'm working with this procedure right now..
Today I played a Record with full dynamics & everything sounds good.
I am going out for the day and will listen when I return.
I have noticed better response during the am than pm but again it's not really consistent.
I'm working on acquring a SPL Meter probably from Radio Shack unless someone I know takes the time to visit me.
I have a portable cd recorder & plan to record when the bass is there & not-maybe hear the difference from the cd I make.
Thanks
Tony

Does anyone know if all the amps in question are MOSFET outputs??

I spoke with Musical Fidelity and was told they are High Current and go low 2ohms
He insisted I don't take the cover off the top

Does anyone know if all the amps in question are MOSFET outputs??

Ralph, I took a look at the schematics for the Bryston B60R and B135 integrated amps, which are available at the Bryston site, and they both use bipolar transistors in their output stages. A post earlier in this thread by Mcintech, dated 4-16-13, indicates that the Musical Fidelity M6i does as well. I couldn't find anything on the web indicating otherwise.

Best regards,
-- Al

Ralph, Al, and Mr. Fishing..., just trying to be a detective, if this problem has occurred with other integrateds/amps, do we know if they use mosfets. If not, and all the amps pucker out with bass, what else is left to check.

I've been harping about the PSB's low impedance specs affecting the MF and whether Zeros might help. The only practical way to check is for Mr. Fishing to borrow, if at all possible, another set of "normal" speakers and see what happens. If all is good, the culpret has been identified -- it's the PSB speakers. I highly recommend this reality check.

If not, it's either the amp, notwithstanding that Mr. Fishing thinks its ok, then the cables, and if cables are ok, then lastly, he should rule out para-normal poltergiest activities. By any chance do we know if Mr. Fishing ever visited Amityville, CT (??). I understand that modern day ghosts are quite mobil.

:>')

BIF