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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 8th Aug 2019, 1:46 am   #1
Northyorks1
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Default Valves wanted EF89- EBC33

Looking for NOS or tested good working order EF89 and EBC33 valves. Know I can get them on ebay, but prefer to ask here first incase anyone has any surplus valves.

Ian
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Old 8th Aug 2019, 9:13 am   #2
cathoderay57
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Default Re: Valves wanted EF89- EBC33

Hi Ian, I have a new in box Elpico EF89 & a good used Mullard EBC33. I will test them, post results & send you a PM later. Cheers, Jerry
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Old 8th Aug 2019, 11:26 am   #3
Northyorks1
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Default Re: Valves wanted EF89- EBC33

Thanks Jerry.
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Old 8th Aug 2019, 1:46 pm   #4
cathoderay57
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Default Re: Valves wanted EF89- EBC33

Here you go. On the VCM163 the valves measure as follows (spec values for a new valve in brackets):

EF89: Ia=11.0mA (9.0); gm=3.7mA/v (3.6)
EBC33: Ia=2.8mA (5.0); gm=1.0mA/v (2.0); a'd=77%; a"d=77%

You have a PM. Cheers, Jerry
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Old 8th Aug 2019, 2:41 pm   #5
cathoderay57
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Default Re: Valves wanted EF89- EBC33

Here are the EF39 and CV1053. Test results:

EF39: Ia=6.8mA (6.0); gm=2.4mA/v (2.2)
CV1053: Ia=6.7mA (6.0); gm=2.4mA/v (2.2)
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Old 13th Aug 2019, 9:59 pm   #6
Northyorks1
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Default Re: Valves wanted EF89- EBC33

Valves now received from cathoderay57, thanks. Can Mods please close this post.

Thanks Ian
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