Pcl84 / 15dq8

[Alastair E]

Anyone know of a nice use for a PCL84?- 15DQ8 Ive got 29 perfect NIB Mazda ones, Now all I need is a use for them!

 

[SHiFTY]

I have 4 NOS PCF80 which are even less useful... Unless your black and white tube TV needs fixing

Still, they might be useful as a driver, or in PP or something... Tube Experiment?

Or sculpture? Wire up the heaters to 15V and use them as christmas lights?

 

[Colt45]

ECL84 is ok for very low power amp..

I tried it, and was surprisingly loud. i found if I drove the pentode with the triode, and used a CD player as source.. it had way too much gain.

I'm sure ECL84 would also make a great 1 tube mu-stage for driving whatever..

 

[Fuling]

World audio design uses ECL80´s in the front end of some of their amps. I´ve tried it too and it works fine, and I guess PCL 80 is the same thing except heater voltage.

 

[AV8R]

PCL84

The PCL84 was intended and used as a video amp in colour TVs.
The pentode section is not really higher enough is plate disipation
for audio output, but not much use with 300mA heater(15 V)

The ECL80 was also a 300mA heater that also happened to be 6.3V. However with a common cathode for the triode and pentode is very limited in it's uses. Some british record players in the late '50s used one as a 11/2 watt amp.

 

[EC8010]

I have 4 NOS PCF80 which are even less useful...

Actually, a pair would make a very nice line stage/buffer. Use the triode section as a cathode follower, and sit it on the pentode section used as a constant current sink. Use a 300mA DC constant current regulated heater supply, and you'd have something with performance completely out of proportion to price.

 

[robo7]

Anyone know of a nice use for a PCL84?-

Hi Alastair!

You can build:
1. a SE Headphone Amp as the ASL MGhead.
2. a small P-P Amp like in the attached Schem.

you have to adjust anode & cathode resistors a little.

 

[robo7]

here it is

 

[robo7]

OK, I'll try to fight the regulations another way

here is a link:

http://www.tubehifi.com/amp/amp/circuit/mghead-c.jpg

 

[dhaen]

Re: PCL84

The PCL84 was intended and used as a video amp in colour TVs.
The pentode section is not really higher enough is plate disipation
for audio output, but not much use with 300mA heater(15 V)

The ECL80 was also a 300mA heater that also happened to be 6.3V. However with a common cathode for the triode and pentode is very limited in it's uses. Some british record players in the late '50s used one as a 11/2 watt amp.

I'm picking actually

PCL84 was used as video amp in B/W TV's mostly.

ECL80 is a difficult beast because of a shared cathode connection.

 

[ilimzn]

It's a long shot but let me ask it anyway:
Has anyone traced triode mode curves for the pentode part of the ECL/PCL84? At least a rough guess at the amplification factor would be of help to me...
Thanks!

 

[Yvesm]

Hi !

Look at:
www.tubes.mynetcologne.de/roehren/roehren.html

You'll find an headphone amp with theses tubes and the plate curves for the penthode strapped as a triode.

Yves.

 

[ilimzn]

Thanks!