Little Bear P3 ?!?! opinions ?

[baco99]

seller sent me a drawing with some minor modifications that's supposed to improve the sound. i can't believe i'm the only buyer to notice these issues!

 

[jazbo8]

seller sent me a drawing with some minor modifications that's supposed to improve the sound. i can't believe i'm the only buyer to notice these issues!

Maybe because no one has bought one...😉

 

[baco99]

Maybe because no one has bought one...😉

Ha! That's a real possibility. Here's the JPG image he sent me with the suggested fixes. Anyone able to decipher why or how this would change the sound?

 

[dallas21]

If it calls gor a 1uf capacitor putting in a 2.2uf cap will totally change the balance of the preamplifier.

 

[ChuckT]

Hi folks,
I got myself on a of those Little Bear P-3 Preamps with JAN 5670 tubes, now I just replaced them with Russian 6N3P-EV tubes (all late 80's stock 😉).
I play my LB P-3 with Sure TPA3116 D class amp and ES9023 DAC and it plays nice but I have few remarks and questions...

• first of all, gain is too high and pot is not usable as it should be, there are 330kΩ resistors (4 around pot) and pot is cheap 50KΩ linear type. What should I do with them? I plan to put stepped attenuator, but what kind should I put there, maybe 100kΩ LOG type?

• there is a little noise I am getting from it, I suppose it is related to rectification circuit, and I'm also suspecting that plain carbon resistors (I believe that they're of that type in stock config) are not suited for the job, probably I should replace them with metal film type on the signal path. Noise is really apparent with higher volume setting.

• there are 4 "Audiophiler" MKP 1µF 400V signal decoupling caps on the stock P-3, will I benefit by replacing them with ClarityCap 2.2µF PX MKP caps?

BTW, I'll appreciate if someone could post Little Bear P-3 schematic...

TIA

Did you found out how to reduce the gain? I have the same P3 tube amp.

 

[evonimos]

Hello to everyone!

I am sorry to ressurect this old thread, but i could not find anyghing else that's relevant to the Little Bear P3.

I own this unit and have used it as a tube "buffer", inbetween the source out and the preamplifier in. It operates without any serious issues (just a faint tube hiss) and does indeed add a bit of "tubeness" to the audio.

However, i wonder if i could use that same unit without much modifications, as a little headphone amplifier.

Is it possible to make it drive a lowish impedance (32 Ohm) headphone set such as the Sennheiser HD518?

Thanks for reading.

Nick, Athens.