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Old 3rd November 2009, 04:14 AM   #1
bob56 is offline bob56  United States
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Default Pl84 tubes

I recently accidently bought some PL 84 tubes. Does anyone have a schematic
for an amplifier using these tubes?
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Old 3rd November 2009, 09:05 AM   #2
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Default Pl84

this is the same as the EL86, different heater rating only. you may use this link: http://www.mif.pg.gda.pl/homepages/f...030/p/PL84.pdf
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Old 3rd November 2009, 09:10 AM   #3
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Try this;

My version of the Simple EL84 or rise of the anti-triode.

Shoog
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Old 5th November 2009, 01:08 PM   #4
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PL84 is almost the same as EL84 but 15V on heaters, and max plate voltage of 200V. Take an EL84 schematic and stick PL84's! Or just build a class A amp. Take a look at datasheet for data.
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Old 5th November 2009, 03:13 PM   #5
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Default Pl84

wrong! bananas are almost like lemons! different operational conditions! different output transformer. please a bit more accuracy in the statements.. a 6l6 is almost the same as an kt88 bcc. similar glass envelope.....
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Old 5th November 2009, 05:35 PM   #6
Arnulf is offline Arnulf  Europe
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Tubesteve is right, EL84 and PL84 are not similar. There are quite a few EL86 designs floating around, refer to one of those (and change heater supply accordingly).
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Old 5th November 2009, 05:54 PM   #7
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Ok, my bad!!!!
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Old 5th November 2009, 05:58 PM   #8
Arnulf is offline Arnulf  Europe
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No biggie, it happens to everybody This is one of the few tubes where one cannot simply follow the naming convention across different heater series.
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Old 5th November 2009, 06:33 PM   #9
davorin is offline davorin  Croatia
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EL86~PL84~UL84 are the same tubes with different Uf/If/Ufk.
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Old 5th November 2009, 06:39 PM   #10
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Quote:
Originally Posted by tubesteve View Post
a 6l6 is almost the same as an kt88 bcc. similar glass envelope.....
More importantly, you didn't mention the credentials of working innards.
Both tubes have specs that are quite different animals. If I went by the envelope/glass shape, this would be fun to see the sparks fly.

richy
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