• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Pcl84 / 15dq8

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#2
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? 🙂
 
#3
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..
 
#5
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.
 
#6
ShiFtY said:
I have 4 NOS PCF80 which are even less useful...
Click to expand...

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.
 
#7
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.
 

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#10
Re: PCL84

AV8R said:
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.
Click to expand...

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.
 
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