EL 509 / 6KG6 output tubes w/plate cap top

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Re: EL 509 / 6KG6 output tubes w/plate cap top

Postby Salo » Wed Nov 06, 2013 10:45 am

I built some three years ago a mono block using soviet 6P45S tubes. These are electrically equivalent to PL519, except the heater voltage/current.

The schematic and one photo attached.

Both transformers are from Italian manufacturer inMadout(.com).
This amplifier gives some 170 W, but the max. power can be increased. Later I made a modification and added a NFET as a screen voltage supply.
With a gas tube only it was a bit too weak for higher power.

Later the max. output power was some 190 W with less than 2 % THD.
Attachments
PL519_6P45S PP.gif
PL519_6P45S PP.gif (27.05 KiB) Viewed 3119 times
6p45s pp1.jpg
6p45s pp1.jpg (182.93 KiB) Viewed 3119 times
Salo
 
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Re: EL 509 / 6KG6 output tubes w/plate cap top

Postby Gingertube » Wed Nov 06, 2013 11:03 pm

When ever using these Horizontal Output type TV tubes you are going to need a screen supply of approx. half the B+

Here is the way the Guitar Amp guys do it - note the power supply. Full wave bridge across a 180-0-180 volt secondary with the 1/2 B+ supply being generated off the CT.
http://www.ozvalveamps.org/goldentone/g ... 963rdw.gif

The 6DQ6 is another of those horizontal output (sweep) tubes.

This is similar to (but not the same as)the full wave voltage double shown in the post above

Cheers,
Ian
Gingertube
 
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Re: EL 509 / 6KG6 output tubes w/plate cap top

Postby Salo » Wed Nov 06, 2013 11:50 pm

Gingertube wrote:When ever using these Horizontal Output type TV tubes you are going to need a screen supply of approx. half the B+


And it should be regulated.
For PL519...EL509 optimum is somewhere between 120...180 V.
Salo
 
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