EC88 (6DL4) NOS Mullard - any use at all? - diyAudio
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Old 7th May 2012, 02:20 AM   #1
Gilgy is offline Gilgy  United Kingdom
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Default EC88 (6DL4) NOS Mullard - any use at all?

Just got a couple of these, impulse buy from a real old-fashioned electronics shop, 3 each. Apparently they make good cathode followers, any other use for them? If not for hifi then I was thinking maybe a summing amp for vintage studio fun.
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Old 7th May 2012, 09:40 AM   #2
tricomp is offline tricomp  Denmark
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Some info from this forum:

E88C (6DL4/ 8255), any circuit for it?

rgds,

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Old 7th May 2012, 11:31 AM   #3
DF96 is offline DF96  England
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Remote cutoff so need to keep grid-cathode signal small: either input stage or CF. Unless you want to use it for an FX box or compressor.
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Old 8th May 2012, 12:08 AM   #4
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Quote:
Originally Posted by DF96 View Post
Remote cutoff so need to keep grid-cathode signal small: either input stage or CF. Unless you want to use it for an FX box or compressor.
Wrong , EC88 it's not a remote cutoff triode , it have high transconductance 13.5mA/V but not variable transconductance .

Last edited by Dimitris AR; 8th May 2012 at 12:38 AM.
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Old 8th May 2012, 11:03 AM   #5
DF96 is offline DF96  England
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I can't find my source for that information, so you may be right. However, if you look at the curves the EC/PC88 characteristics tuck in at the bottom more than those for the EC/PC86 so it is at least leaning towards remote cutoff. This would ease the application of AGC in a UHF TV tuner.
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Old 8th May 2012, 11:57 PM   #6
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One thing is sure , that it's not mentioned anywhere in the Phillips data that the PC88 ( EC88 ) is a variable transconductance tube , see the data of the PC95 the first thing mentioned is that this tube is a vari gm tube and look at it's curves to see how the curves fall sharply when Vg is more negative than -1.5V which is by far more sharply than PC88 curves .

Last edited by Dimitris AR; 9th May 2012 at 12:06 AM.
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