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FERNSEH · 24th Jun 2021, 11:43 am

Beery wrote: "In my Garrick, which is a development of the T5 design, PEN46 valves replace the 41MP valves. The PEN46 was designed for line output use."
Hi Andy,
for the sake of reliability I might try a PEN46 in the T5 and T23. The beam tetrode PEN45 has a higher anode impedance ra compared with the triode 41MP. In this application the valve operates as a switch rather than a linear amplifier.
Something to consider in the future, in the meantime let's get the T5 timebase working first.

DFWB.

24th Jun 2021, 11:43 am	#388
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Baird T5 restoration project. Beery wrote: "In my Garrick, which is a development of the T5 design, PEN46 valves replace the 41MP valves. The PEN46 was designed for line output use." Hi Andy, for the sake of reliability I might try a PEN46 in the T5 and T23. The beam tetrode PEN45 has a higher anode impedance ra compared with the triode 41MP. In this application the valve operates as a switch rather than a linear amplifier. Something to consider in the future, in the meantime let's get the T5 timebase working first. DFWB.