which amp???

[The G.O.A.T.145]

I am looking at 3 vintage amps for about the same price which would you choose based on your opinion seeing as how i have never listened to either of them and am not familiar with them as well
please include why and any advice as well and what price they should be.

They will be running a pair of celestion 66's

op 1 = McIntosh MC2120 7/10 cosmetic scuffs

op 2 = Perreaux PMF2150B (Class A) ?

op 3 = Bryston 2B-LP

Thanks

[The G.O.A.T.145]

anyone???

[h_a]

This is a do-it-yourself forum

Have fun, Hannes

[djk]

The McIntosh with some cap upgrades will sound better than the Perreaux PMF2150B (which is not class A), or the small Bryston.

I was a dealer for all three brands, I still own two MC2120.

The small electrolytic caps in the Perreaux PMF2150B are going to be worn out and need replacing. I just helped one of the engineers at work with his (funny, we both worked in the same stereo shop 20 years ago).

"Which caps are they DJK? I'll try them in my 2125."

Add one 47µF across each ±42V rail at the main filter caps

Add a 0.01µF~0.1µF film cap in parallel with C239, 240 (little board on the input jacks, very tight for space)

Add a 0.1µF film in parallel with C203, 204 (input coupling cap to impedance buffer)

Add a 0.1µF film in parallel with C207, 208 (output coupling cap from impedance buffer)

Add a 0.1µF film in parallel with C219, 220 (feedback cap)

Add a 0.1µF film in parallel with Q215, 216 (bias transistor)

Add a 0.1µF film in parallel with C305, 306 (±15V regulator outputs)

Add a 0.1µF film in parallel with D304, 305 (reference diodes for regulators)

I cut off all the push on connectors in the power supply and speaker relay and soldered them direct. I soldered a pair of 0.1µF film across the speaker relay contacts and cleaned the relay contacts with a sheet of paper and applied De-oxit.

I sprayed De-oxit on the RCA jacks, cleaned the input sensitivity selector switch (very important), and the edge connectors for the L and R amp boards.

I removed the 10-32 screws on the main filter caps and used De-oxit before replacing.

Do not move the chassis with the bottom off, the glass could crack. Put it on a small piece of carpet to help turn at different angles.

The 47µF are under a lot of stress, I used 100V caps even though they only run at 42V.

Even though this changes no measurable performance specification, it will change the sound more than you can believe.

Jackhammer bass from an amp with a DF of only 14?


----------------------------------------------------------------------------

The above $4 worth of parts mod makes the McIntosh sound better than 99% of current model amplifiers.

[The G.O.A.T.145]

Thanks for the advice and wow! maybe you can help me with cap replacement for a crossover from some celestion 66's?
thanks once more

[The G.O.A.T.145]

Originally posted by djk
The McIntosh with some cap upgrades will sound better than the Perreaux PMF2150B (which is not class A), or the small Bryston.

I was a dealer for all three brands, I still own two MC2120.

The small electrolytic caps in the Perreaux PMF2150B are going to be worn out and need replacing. I just helped one of the engineers at work with his (funny, we both worked in the same stereo shop 20 years ago).

"Which caps are they DJK? I'll try them in my 2125."

Add one 47µF across each ±42V rail at the main filter caps

Add a 0.01µF~0.1µF film cap in parallel with C239, 240 (little board on the input jacks, very tight for space)

Add a 0.1µF film in parallel with C203, 204 (input coupling cap to impedance buffer)

Add a 0.1µF film in parallel with C207, 208 (output coupling cap from impedance buffer)

Add a 0.1µF film in parallel with C219, 220 (feedback cap)

Add a 0.1µF film in parallel with Q215, 216 (bias transistor)

Add a 0.1µF film in parallel with C305, 306 (±15V regulator outputs)

Add a 0.1µF film in parallel with D304, 305 (reference diodes for regulators)

I cut off all the push on connectors in the power supply and speaker relay and soldered them direct. I soldered a pair of 0.1µF film across the speaker relay contacts and cleaned the relay contacts with a sheet of paper and applied De-oxit.

I sprayed De-oxit on the RCA jacks, cleaned the input sensitivity selector switch (very important), and the edge connectors for the L and R amp boards.

I removed the 10-32 screws on the main filter caps and used De-oxit before replacing.

Do not move the chassis with the bottom off, the glass could crack. Put it on a small piece of carpet to help turn at different angles.

The 47µF are under a lot of stress, I used 100V caps even though they only run at 42V.

Even though this changes no measurable performance specification, it will change the sound more than you can believe.

Jackhammer bass from an amp with a DF of only 14?


----------------------------------------------------------------------------

The above $4 worth of parts mod makes the McIntosh sound better than 99% of current model amplifiers.

You dont have pictures for all that stuff do you? and where i could get it???

[djk]

I'm sorry, but if you don't know what a 0.1µF film cap is, or where to buy it, should you really be looking at doing this?

[The G.O.A.T.145]

I know what it is, just looking for some brand recommendations, and where/ what company's to source the parts from. (I am only a first year electrician and we haven't taken that in school yet, so I know what they are just not how the different types would affect audio flow)

[whubbard]

You can just get some Panasonic - ECG from Digikey for 0.1µF

There area a lot more options out there (some much more expensive), but these will get the job done for pretty low cost.

For the 47µF I would try some Solen PPE.

-West

[The G.O.A.T.145]

thanks but to be more specific, possibly part numbers?
i have no idea on ordering them and this is my first time
I also note that it said film but what kind (dry, poly ect)