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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 2nd July 2020, 03:26 PM   #811
Tubelab_com is offline Tubelab_com  United States
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Location: West Virginia panhandle
Quote:
Would this cap work: ESMH160VSN104MA80T United Chemi-Con | Mouser
It should be fine.

Quote:
it might be my PT complaining about having too much current drawn from it.
I have built several amplifiers including my original Lexan TSE with a transformer that was too small with good luck except for the heat produced.

When a transformer is feeding a rectifier follower by a cap input filter most of the current is drawn right at the peak of the sine wave. The TSE and TSE-II are worse in this regard because two out of three secondaries have this type of load. This can cause the transformer to exhibit higher losses at the peak current point.

An oversized transformer is good in this case. I am using a Hammond 372HX on my TSE-II because I had one. It was originally intended to power TWO SPP boards at the same time, which it did just fine, but wouldn't work with my odd packaging scheme that I made for this amp.

The 372HX works good in the TSE-II with 300B's at about 385 volts, and 2A3's at about 380 volts (way over spec). The increased filament draw is the reason for the 5 volt B+ drop.

The 370FX should do fine with 45's.

Edit, My email box tells me that AES (tubesand more.com) has "everything 10% off this week." I don't know if that's a deal or not since I haven't bought anything from them in a few years.
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Last edited by Tubelab_com; 2nd July 2020 at 03:29 PM.
 

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