EL82 - PL82 PP amplifier

[56085]

OK than. You're right.

 

[Ketje]

The EL41 is not just the 6.3 V version of the UL41. There are other (big) differences. So the EL41 and the EL82/PL82 are not compatible.

Yes, I overlooked that 😱
It's a wonder the PL82 and EL82 are the same (exept the heater) with the EL84 differs from the PL84, EL41 and UL41 and even long time ago the EBL21 is different from the UBL21.
Not very logical 🙁
Mona

 

[Kay Pirinha]

No, it really isn't. In each and every case we have to look into the datasheet, as for some tubes the parallel and the series heater variants indeed are identical (ECL82 ~ PCL82 ~ UCL82, ECL86 ~ PCL86, EL36 ~ PL36 and many others), in others they aren't, as the series tubes are designed just to cope with low supply voltages also (from ~100 Vdc on).
Probably the most puzzling example is ECL83 vs. PCL83: Same pentodes, but very (!) different triodes.
Best regards!

 

[Ketje]

Xheater followed by tube code.If you change the heater change the X.If it's an other tube change the tube code.
Here they change the heater code but keep the tube code, never the less change the tube.
Logic ? 😕
Mona

 

[ChrisABC]

MJ1711_(04)EL82-CSPP-power-amp_NagashimaK.pdf - Google Drive

from

遠い昔のラジオ少年 HOME


(sorry, this was posted earlier)

 

[Kay Pirinha]

As I said. In the past I've learned to basically regard two components as different, if the designator differs somewhere.
Best regards!

 

[Kay Pirinha]

MJ1711_(04)EL82-CSPP-power-amp_NagashimaK.pdf - Google Drive

from

遠い昔のラジオ少年 HOME

PFL200 has posted this example in #10 yet.
Anyway, even the Philips datasheet gives hints on how to design a PL82 class AB PP amplifier.
Best regards!

 

[56085]

No logic. Even the ECC85 is a bit different than the PCC85/UCC85. But looking in the datasheet is a good practice anyway if you want to use some tube type.

 

[56085]

PFL200 has posted this example in #10 yet.
Anyway, even the Philips datasheet gives hints on how to design a PL82 class AB PP amplifier.
Best regards!

TS has posted that he knows the Philips datasheet in #1 yet.

 

[Kay Pirinha]

No, not really. There's no PL82 datasheet that reads a 12 watt plate rating, especially not a Philips one.
Best regards!

 

[56085]

TS wrote in post #1:

"The Philips data sheet mentions 12W, Va = 200, Vg = 200, Raa = 4k in pp configuration."

There's no mentioning the plate rating there. TS meant an output power of 12 Watt like written on page 3 of this Philips datasheet for the PL82:

https://frank.pocnet.net/sheets/030/p/PL82.pdf

So really not really?

 

[ChrisABC]

from Dutch Forum


Google Translate

 

[csongore]

6п18п

I have built and tested several amplifiers with EL86 (6P43P-E), which is quite close to EL82.
With 300 V supply voltage and 5k UL-output transformer, more than 20 W is possible to get. With 250 V and 4k UL-OPT, it is possible to have some 15 W.

This is my test circuit, a Dynaco-style pentode amplifier/cathodyne phase inverter with 6F12P triode pentode.

Hello i want to build your amp with 6P43P if you can help me with some answers:

P3 100K you change gain or set voltage on G2?
What is the input sensitivity for P max. ?

Thanks

 

[artosalo]

P3 100K you change gain or set voltage on G2

P3 is G2 voltage adjustment. You can simplify the circuit by omitting P3 and R23. Then change R6 to 220k. No adjustment needed.

What is the input sensitivity for P max. ?

0.4 Vrms to 25 W out. Then GNFB should be 14 dB (R5 = 1k)

 

[csongore]

Thanks for your reply 👍