Parts Database

[Steve K]

I thought it might be good to have a central place to go to for the various parts and their corresponding numbers that you may encounter in a build. Being new here I don't have much to contribute but I know there are some with a ton of info. Feel free to add whatever you think is appropriate.

 

[laatsch55]

50 amp bridge rectifier-----------905-KBPC5006T
Snubber caps for same-----------5989-400V.01-F

 

[laatsch55]

1-1/2" standoffs for DC protect board in the 700's--------534-2206 Mouser

 

[laatsch55]

Switchcraft RCA jacks------------502-3501FRX Mouser

 

[laatsch55]

Speaker binding posts.....


White---------530-111-0101-1
Black----------530-111-0103-1
Red-----------530-111-0102-1 Mouser

 

[Steve K]

The mans on a roll!

 

[laatsch55]

I'll have more as I dig the old packages out...what I don't have is the fuseholder numbers, Joe does though...

 

[Steve K]

Knobs- Antique Electronic Supply
Aluminum- P-K312
Black- P-K313

 

[laatsch55]

Good man....

 

[Gepetto]

Fuses (Eaton/Bussmann):

AGX-5A equates to Mouser part number 504-AGX-5
AGC-8A equates to Mouser part number 504-BK/AGC-8-R

Fuse holder (Eaton/Bussmann):

Mouser part number 504-BK/HKP-R

 

[laatsch55]

What's the Berquist sil-pad number Joe?

 

[Steve K]

I stole this from one of Joe's posts.
Bias Adjust Pot- Mouser#- 531-pt15b-5k

 

[laatsch55]

That was for the original PL14,20 board I believe...

 

[Gepetto]

That was for the original PL14,20 board I believe...

That is pretty much the pot that PL used on every one of their original control boards. Open frame carbon pot.

 

[grapplesaw]

That is pretty much the pot that PL used on every one of their original control boards. Open frame carbon pot.

Ok, pardon me, but all the ones I have in the series two are just 1k pots. I see no need for 5k ones
have missed something here ????!

 

[laatsch55]

On every thing else 5K....

 

[grapplesaw]

On every thing else 5K....

Ok thanks for the info

 

[Gepetto]

Ok, pardon me, but all the ones I have in the series two are just 1k pots. I see no need for 5k ones
have missed something here ????!

Hi Glen

The bias pot has always been 5K on every PL board up to the S2 when they switched to a 1K and cost reduced the bias circuit.

 

[grapplesaw]

Hi Glen

The bias pot has always been 5K on every PL board up to the S2 when they switched to a 1K and cost reduced the bias circuit.

Thank you Joe

so my curiosity got to me on this one

the total ohms resistance on a series two pl36 at the base of the bias transistor is about 1400 to 1500 ohms (with a fixed 680 ohm resistor and veri resistor). I measured your rev E board sitting on the bench and it was 2200 ohms (1000 fixed resistor and veri pot) to the base. Both boards have about .380 mv bias when running in the same backplane amp. Does running the opa134 verse the stock 351 have different out put to the pot?

I was going to try some Opa134 in the stock pl32 d500 board. I already reduced the stock fixed resistor in that circuit from 860 ohm to 680 ohm as used in the pl36 board. I guess putting a 5k or 2 k pot will give more range but could cause more heat in the pot as well.

well one more thing for discussion

 

[Gepetto]

Thank you Joe

so my curiosity got to me on this one

the total ohms resistance on a series two pl36 at the base of the bias transistor is about 1400 to 1500 ohms (with a fixed 680 ohm resistor and veri resistor). I measured your rev E board sitting on the bench and it was 2200 ohms (1000 fixed resistor and veri pot) to the base. Both boards have about .380 mv bias when running in the same backplane amp. Does running the opa134 verse the stock 351 have different out put to the pot?

I was going to try some Opa134 in the stock pl32 d500 board. I already reduced the stock fixed resistor in that circuit from 860 ohm to 680 ohm as used in the pl36 board. I guess putting a 5k or 2 k pot will give more range but could cause more heat in the pot as well.

well one more thing for discussion

Hi Glen
Q6 does all the work (and that is not much), the base circuit (the pot) is very, very low power (~5 microwatts) due to the large gain of the Q6 transistor.