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Old 4th April 2005, 07:52 PM   #1
Fuling is offline Fuling  Sweden
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Default PL519 PP design

Hi

Iīve searched a lot for info on PL519 (or PL/EL509) amps, but almost everything I found is about OTL amps.
Thing is that I bought a bunch of PL519 today for a very nice price, and I want to put them to use in a bass guitar amp project
that has been floating around for a while.

My question: Would a pair of PL519 be a good match for a Hammond 1650T (1,9k 120W) OPT, with about 450V on the plates?

I know Bruce Rosenblitz has designed something similar to this, does anyone have a schematic or some relevant infor about that design?

Iīm kinda stuck to the 450-500V plate voltage, since that is what my in stock power transformers delivers and I donīt want to buy a new one.

Cheers
/Daniel
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Old 5th April 2005, 05:58 AM   #2
sajti is offline sajti  Hungary
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PL519 works quite good with this transformer! With 400-450V anode, and 150V screen, You can get about 100W output power, in class AB. The recommended plate to plate impedance should be 2kohms, but 1.9k no problem.

sajti
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Old 5th April 2005, 10:02 AM   #3
Fuling is offline Fuling  Sweden
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Thanks Sajti!
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Old 25th April 2005, 06:17 AM   #4
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I have a schematic i can send you, its of the amp i am building, 150w PK uses PP el509/519 . As i understand it, it uses a 12ax7 for an input tbe, a 12at7 for the phase splitter. These drive 2 el509's in PP connected to a hammond 1650t . 6bm8's for screen regulators for the el509s.

I have built and today tested the phase splitter sections for the left and right channels. The PCB's i madequite nice, and saved a LOT of time. I have not yet tested the screen regulator portion. It is not yet complete, i am awating some back ordered parts. I also made a PCB for this section.

Unfortunatily, i think the PCB files were lost when my computer crashed. I may still have a hard paper copy i can scan for you.
Oh i hope you dont mind the 700v B+, be carefull!!!
Tom
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Old 25th April 2005, 06:37 AM   #5
Fuling is offline Fuling  Sweden
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Very generous of you, but a guy here in Sweden sent me that schematic a couple of days ago and I donīt need two
Thanks anyway!
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Old 25th April 2005, 08:31 AM   #6
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Sweep tubes are great.

Lemme see here...

500V minus 50V typical saturation = 450V peak, sinewave = 318.2Vrms = 636.5V across 1.9k primary = 213W (426W squarewave). Hmm, sounds like 500V for that tranny will be more than enough

It'd have to run at 600mA bias per tube though, class A is out of the question!
Class AB might run, lesse, it's what 30 or 40W max.? Let's say 60mA bias per tube. That leaves a peak of what, maybe 800mA the tube has to reach, you can check the datasheet for what screen voltage is required. Probably not much given this beefy type.

Tim (master of the SWAG)
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Old 25th April 2005, 10:36 AM   #7
sajti is offline sajti  Hungary
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Quote:
Originally posted by Sch3mat1c
Sweep tubes are great.

Lemme see here...

500V minus 50V typical saturation = 450V peak, sinewave = 318.2Vrms = 636.5V across 1.9k primary = 213W (426W squarewave). Hmm, sounds like 500V for that tranny will be more than enough

It'd have to run at 600mA bias per tube though, class A is out of the question!
Class AB might run, lesse, it's what 30 or 40W max.? Let's say 60mA bias per tube. That leaves a peak of what, maybe 800mA the tube has to reach, you can check the datasheet for what screen voltage is required. Probably not much given this beefy type.

Tim (master of the SWAG)
I made 30W PP amplifeir with triode connected PL509s. It was nice, but not as good, as the 6550 sounds in triode mode.
HT=300V, -Ug1=75V, bias 100mA. Raa=2k2. the output is little more than 30W. But it needs very heavy driver stage to get the large driving signal.
In tetrode mode I used HT=460V, Ug2=150V (with VR150 regulator), Raa=2k2 (same output transformer). The output is about 120W, if the power supply is large enough. 140W possible, with regulated HT. Bias is about 50mA class AB.
PL509 is very nice valve. Long lasting, heavy, and can handle almost anything. Due the large cathode, it can useful up to 1.4A peak.

sajti
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Old 25th April 2005, 10:41 AM   #8
Fuling is offline Fuling  Sweden
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460V B+ and 2,2k Ra-a=120W, thatīs very interesting!

I guess 1,9k Ra-a would work just about as good as 2,2k, and I have a few beefy power transformers that puts out 450-500V with a lot of current.

Too bad Iīve already started on my 4x807 project, but itīs never too late to change
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Old 25th April 2005, 10:50 AM   #9
AV8R is offline AV8R  United Kingdom
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Default PL509/519/40KG6

I have been using these tubes for over 30 years and started the revolution in audio, so suddenly everyone is finaly waking up.

In pairs push pull Class B 180 watts is achievable. Class AB1 140 reliable watts is achievable . Pure Class A is 35 watts period.

Remember electrons have no memory. They don't know where they have been!
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Old 25th April 2005, 11:47 AM   #10
sajti is offline sajti  Hungary
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Quote:
Originally posted by Fuling
460V B+ and 2,2k Ra-a=120W, thatīs very interesting!

I guess 1,9k Ra-a would work just about as good as 2,2k, and I have a few beefy power transformers that puts out 450-500V with a lot of current.

Too bad Iīve already started on my 4x807 project, but itīs never too late to change

I have another schematic for PL509, which give 120W, with HT=400V, and Vg2=200V, I don't know the Raa, but I can check it.

sajti
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