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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Can someone explain "primary inductance" of an output transformer? posted by VoltSecond on August 16, 2024 at 16:05:08:
Looking into some Push Pull Output Transformer models,
for example Dynaco ST70 A470
.SUBCKT A470 P1 Sg1 B Sg2 P2 Sp1 Sp2
* Dynaco A470. Push Pull transformer, with Ultralinear taps at 33%, 5600 to 16 ohms, 3db 7 to 56000 hz
*
* model generated by TransformerModels.xls yyyy Jan 22
*
LP1 1 Sg1 7.29664888730406
LS1 2 B 1.77011598090312
LS2 3 Sg2 1.77011598090312
LP2 4 P2 7.29664888730406
LSA 5 Sp2 0.18300530603261
*Seems* to be violating this criterion:
OPT primary inductance > (load impedance)/120
Well, A470 was designed for EL34.
Looking into a manufacturer's published data for 5K push pull DHT OPT:
https://shop.piemme-elektra.it/Categories/92/Products/8266
Total Primary inductance: > 40H @100Hz 5V
5K/120 ~ 40H
criterion seems to be observed.
Does tube plate impedance matter wrt primary inductance ?
Any insight ??
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Follow Ups
- RE: Can someone explain "primary inductance" of an output transformer? - engineer@baymoon 10:14:51 08/22/24 (4)
- RE: Can someone explain "primary inductance" of an output transformer? - engineer@baymoon 20:25:06 08/23/24 (0)
- RE: Plate Impedance wrt to Primary Inductance - VoltSecond 21:52:53 08/22/24 (2)
- RE: Plate Impedance wrt to Primary Inductance - Paul Joppa 08:38:46 08/23/24 (1)
- There are tubes that aren't triodes? :-) - Tre' 18:54:05 08/26/24 (0)
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