Tube question for the experts

FM does it with frequency!
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musiconradio.com
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Tube question for the experts

Post by musiconradio.com » Tue Aug 08, 2017 11:34 am

Hi yall,

Tube Question:

What is the difference between a 3CPX1500A7 (YC-257) and 3CX1500A7 (8877) Are they both the same, and can they be used in a RF amplifier for FM. Thanks.

COMMENG
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Re: Tube question for the experts

Post by COMMENG » Tue Aug 08, 2017 12:08 pm

Here are some comparative tube Specifications:

http://www.g8wrb.org/triodes/


COMMENG

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kkiddkkidd
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Re: Tube question for the experts

Post by kkiddkkidd » Tue Aug 08, 2017 2:17 pm

musiconradio.com wrote:
Tue Aug 08, 2017 11:34 am
What is the difference between a 3CPX1500A7 (YC-257) and 3CX1500A7 (8877) Are they both the same, and can they be used in a RF amplifier for FM. Thanks.
As I recall, the P is a version with higher plate voltage capability and maybe a little higher freq operation. I recall that the ceramic insulator is a little taller and anode is a little squattier. CCA FM10000's used a 3CX800 driver. Dick (Grose?) down at D&C Electronics (now part of Richardson) recommended the P version and to crank the driver plate up. I did so on 2 different TX's and seemed to get better driver tube life. Of course the final was still that awful 3CX6000 (YU148).

I have no idea if there are any advantages in the 1500.

Later,
--
Kevin C. Kidd CSRE/AMD
WD4RAT
AM Ground Systems Company
http://www.amgroundsystems.com
KK Broadcast Engineering
http://www.kkbc.com

musiconradio.com
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Re: Tube question for the experts

Post by musiconradio.com » Tue Aug 08, 2017 6:45 pm

Thanks everyone for the feedback. It is appreciated.

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