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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 27th Jun 2018, 10:26 am   #1
ukcol
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Default NOS Mazda AC4/Pen (CV1326)

I'm looking to purchase a New Old Stock AC4/Pen valve (or 2 if you have them).

I bought a NOS pair about 4 years ago to replace an old pair in a P-P output stage. One had about 90% emission but the other one was very low. One of the new ones has failed to zero emission, I am pretty sure it is a weld failure as it will momentarily work if tapped with a screwdriver handle. The set is running at the moment with the good NOS valve and the serviceable old one.

I mention the above to explain why I am after a NOS valve and not a good tested old one. Thanks.
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Old 27th Jun 2018, 11:15 am   #2
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Default Re: NOS Mazda AC4/Pen (CV1326)

Are the pins needing a resolder may be as a long shot?
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Old 27th Jun 2018, 11:18 am   #3
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Default Re: NOS Mazda AC4/Pen (CV1326)

Been there done that.
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Old 11th Jul 2018, 11:03 am   #4
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Default Re: NOS Mazda AC4/Pen (CV1326)

Time for the 14 day bump.

I am still after a NOS AC4/Pen (or two if you have them).
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Old 11th Jul 2018, 12:18 pm   #5
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Default Re: NOS Mazda AC4/Pen (CV1326)

This a CV1326 and was available a while ago from Langrex at a fair price.
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Old 11th Jul 2018, 12:24 pm   #6
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Default Re: NOS Mazda AC4/Pen (CV1326)

Langrex was my first port of call but they don't have any now but thanks anyway.
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Old 11th Jul 2018, 12:47 pm   #7
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Default Re: NOS Mazda AC4/Pen (CV1326)

Just had a look, but only have an NOS AC2/PEN Colin, which I presume is no good?

Andy.

PS also have an AC/PEN, which I also presume is no good. Don't know much about these early pentodes I'm afraid.
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Old 11th Jul 2018, 3:43 pm   #8
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Default Re: NOS Mazda AC4/Pen (CV1326)

It must be an AC4/Pen Andy, but thanks for looking.
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Old 11th Jul 2018, 7:21 pm   #9
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Default Re: NOS Mazda AC4/Pen (CV1326)

Gerry Horrox might have one - give him a call https://www.crowthornetubes.co.uk/

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Old 11th Jul 2018, 8:17 pm   #10
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Default Re: NOS Mazda AC4/Pen (CV1326)

Thanks Craig, I'll give him a call tomorrow.
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Old 12th Jul 2018, 3:32 pm   #11
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Default Re: NOS Mazda AC4/Pen (CV1326)

Gerry didn't have one but he very kindly pointed me to someone who did and so I now have one NOS AC4/Pen.

I am still looking for another NOS AC4/Pen if anyone has one.
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Old 20th Jul 2018, 8:57 am   #12
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Default Re: NOS Mazda AC4/Pen (CV1326)

When my "NOS" AC4/Pen arrived it turned out to be a used one with 52% emission and a gm of 7.8 and so I am still looking for 2 NOS AC4/PENs.
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Old 20th Jul 2018, 10:18 am   #13
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Default Re: NOS Mazda AC4/Pen (CV1326)

Sorry to hear that - Gerry is usually absolutely reliable, even if he is just recommending someone else.

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Old 21st Jul 2018, 8:05 pm   #14
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Default Re: NOS Mazda AC4/Pen (CV1326)

No blame is to be attached to Gerry and I think the supplier concerned just made a mistake rather than was being deceitful. The valve I did get has 52% emission and a gm of 7.8 and I intend to keep it.

I think supplies of the AC4/Pen are drying up now so I may not find any NOS examples.
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Old 21st Jul 2018, 9:02 pm   #15
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Default Re: NOS Mazda AC4/Pen (CV1326)

Not NOS, but used tested, might be worth a look:

https://www.ebay.co.uk/itm/One-used-...sAAOSwoNhbPhAl
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Old Yesterday, 10:16 am   #16
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Default Re: NOS Mazda AC4/Pen (CV1326)

That's an AC/Pen David. Thanks anyway.
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