Hexode

[Johan Bekaert]

Hello,

 I'm not a tube expert like many of you, but I like to work on old radio's, and I have a uTracer 3+. Last week a neighbour asked me to have a look on his grandfather's radio, a Philips BX373a (1948).  It has 3 tubes, an EBL21 and 2  ECH21. The LF works thus the EBL is ok. To get the AM working, I suspect the two ECH (=heptode + triode). Problem: as these are old guys, I don't have another one, let alone two, to swap and see. In the uTracer then, but leave the other grids g3,4,5 open? I get a flat zero curve. What am I doing wrong? How do you properly test a heptode or hexode? And the triode in it, as I find absolutely no performance info on the triode? Thanks!

Jo

[James Hall]



Hi Jo:

This might help - http://www.r-type.org/exhib/aaa0078.htm .

73, Jamie

WB4YDL

Sent from my iPad

Sent from my iPad

On Mar 6, 2024, at 8:25 AM, Johan Bekaert <jo.be...@gmail.com> wrote:



Hello,

 I'm not a tube expert like many of you, but I like to work on old radio's, and I have a uTracer 3+. Last week a neighbour asked me to have a look on his grandfather's radio, a Philips BX373a (1948).  It has 3 tubes, an EBL21 and 2  ECH21. The LF works thus the EBL is ok. To get the AM working, I suspect the two ECH (=heptode + triode). Problem: as these are old guys, I don't have another one, let alone two, to swap and see. In the uTracer then, but leave the other grids g3,4,5 open? I get a flat zero curve. What am I doing wrong? How do you properly test a heptode or hexode? And the triode in it, as I find absolutely no performance info on the triode? Thanks!

Jo

--
You received this message because you are subscribed to the Google Groups "uTracer" group.
To unsubscribe from this group and stop receiving emails from it, send an email to utracer+u...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/utracer/CACd%3D2bCChzCbE0We0E2fc811%3DHbBVxmeT-UEAj3UQS%3DSUEu3og%40mail.gmail.com.