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Old 22nd April 2012, 12:36 PM   #11
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I've had EC86s as the second stage in my phono preamp for years now without any precautions other than a grid-stopper to one of the grids and they've never given me any trouble unlike the triode-connected D3as I used to have as the front end. I use triode-connected E810Fs in that position now, with a similar lack of drama.
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Old 22nd April 2012, 12:49 PM   #12
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Some more about the EL/PL36

CHAMP ELECTRONICS
Champ CBA-500 Bass Guitar Amp

Also, hupse claims: "The original mullard EL36 is an octal variant of the EL6"
Here is the EL6 datasheet wich might help get you started with the EL36 in audio.
http://www.mif.pg.gda.pl/homepages/f.../046/e/EL6.pdf

PS: talking about the in-box oscillators, ever tried to tame a PL802?
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Old 22nd April 2012, 01:13 PM   #13
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Hidnplayer,

your original Mullard EL36's aren't the same as those dealt in the Champ and Australian articles!

Best regards!
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Old 22nd April 2012, 02:39 PM   #14
Yvesm is online now Yvesm  France
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Quote:
Originally Posted by hidnplayr View Post
. . .
PS: talking about the in-box oscillators, ever tried to tame a PL802?
Yeap

Click the image to open in full size.

A wonderfull driver !

Yves.
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Old 22nd April 2012, 04:17 PM   #15
Fuling is offline Fuling  Sweden
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I have used PC86 in several projects where Ive wanted a bit of gain and voltage swing. Never seen one oscillate and I only use one grid stopper in the kiloohm range.
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Old 22nd April 2012, 05:19 PM   #16
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Quote:
Originally Posted by Fuling View Post
I have used PC86 in several projects where Ive wanted a bit of gain and voltage swing. Never seen one oscillate and I only use one grid stopper in the kiloohm range.
And how can you be so sure that it not oscillates?
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Old 22nd April 2012, 06:59 PM   #17
Koifarm is offline Koifarm  Netherlands
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Nice thread.

I have a couple of new telefunken PC86, will they sound as the ECC types?

Ronny
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Old 22nd April 2012, 09:15 PM   #18
JohanB is offline JohanB  Sweden
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Quote:
Originally Posted by Koifarm View Post
Nice thread.

I have a couple of new telefunken PC86, will they sound as the ECC types?

Ronny
A well built premium brand PC/EC86 or the special quality type E86C (with gold pins) has more gain, lower noise and is a more linear triode than E88CC types. Should then preferbly be run with over 5mA anode current and at least 100-120VDC to avoid grid current.

http://frank.pocnet.net/sheets/062/e/E86C.pdf

In order to run a PC86 (3,8V, 300mA) on a 6,3V heater voltage you just need a 8,2 Ohm, 1-2W resistor in series with the heater.

Johan
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Old 22nd April 2012, 10:25 PM   #19
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Most readers here know that I have been playing with TV tubes since the 60's when they were free for the taking at the local trash dump. I have been going through my tube collection sorting out the stuff to keep, and the stuff that must find a new home. In the process I have found a few oddities that even I didn't know existed.

Ever seen an EL84 with a plate cap????? Yeah I didn't think so until I had it in my hand. This one is made in the USA by Sylvania and has a 1980 date code. It is an EL804. The specs reveal that it is really a 6CW5/EL86 with a plate cap.

Most of us here know by now that the venerable 6L6GA was repurposed as a transmitting tube, the 807, and a sweep tube, the 6BG6GA. Do you know that it was also stuffed into a 6V6GT sized envelope and sold as a sweep tube for smaller TV sets? Would you want to find some NOS black plate RCA 6L6GA's in a tiny bottle with a different pinout for $3 each?
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Old 22nd April 2012, 11:25 PM   #20
Fenris is offline Fenris  United States
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I just finished (powered up and tested today) an amp using a pair of 13DE7 TV tubes. I'll post the details in a new thread so this one doesn't get polluted.
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