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Old 5th March 2004, 09:23 AM   #1
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Default Pcl84 / 15dq8

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!
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Old 5th March 2004, 09:36 AM   #2
SHiFTY is offline SHiFTY  New Zealand
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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?
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Old 5th March 2004, 09:40 AM   #3
Colt45 is offline Colt45  Serbia
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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..
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Old 5th March 2004, 09:59 AM   #4
Fuling is offline Fuling  Sweden
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World audio design uses ECL80s in the front end of some of their amps. Ive tried it too and it works fine, and I guess PCL 80 is the same thing except heater voltage.
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Old 5th March 2004, 10:27 AM   #5
AV8R is offline AV8R  United Kingdom
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Default 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.
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Old 5th March 2004, 10:48 AM   #6
EC8010 is offline EC8010  United Kingdom
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Quote:
Originally posted by ShiFtY
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.
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Old 5th March 2004, 01:25 PM   #7
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Default 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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Old 5th March 2004, 08:20 PM   #8
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here it is
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Old 5th March 2004, 09:57 PM   #9
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OK, I'll try to fight the regulations another way

here is a link:

http://www.tubehifi.com/amp/amp/circuit/mghead-c.jpg
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Old 5th March 2004, 11:43 PM   #10
dhaen is offline dhaen  Europe
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Default Re: PCL84

Quote:
Originally posted by AV8R
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.
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