EC88 (6DL4) NOS Mullard - any use at all?

[Gilgy]

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.

 

[tricomp]

Some info from this forum:

http://www.diyaudio.com/forums/tubes-valves/41142-e88c-6dl4-8255-any-circuit.html

rgds,

/tri-comp

 

[DF96]

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.

 

[Dimitris AR]

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 .

 

[DF96]

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.

 

[Dimitris AR]

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 .

 

[jimcochran]

Hi,
Im new to diyaudio and saw this older thread. I have a quad of these EC88 / 6DL4 Amerex Bugle Box tubes NOS /NIB one pair was made in Heerlen Holland 1961 and the other pair has etched codes that indicate made in 1964 by Valvo Germany. I have a Military TV7 A/U that has been upgraded to a TV7 D/U with plate current jacks added. I have looked through all the TV7 data charts and addendum all over the web and this tube is not listed. Does anyone on this forum have the TV7 data setting for this tube : EC88 / 6DL4 ?

thank you in advance for your reply. kindest regards, Jim