Paramour rebuild with MQ 60H choke - what size CAP?

[CentripetalMan]

I am going to rebuild my Paramours and finally use the 60H MQ chokes with brass endbells. Using 2A3 tubes, what size should the parafeed capacitor be?  Thanks!

 

[Paul Birkeland]

Which output transformers are you going to use with these?

 

[CentripetalMan]

I'm going to use 4K parafeed transformers.

Thanks!

Which output transformers are you going to use with these?

 

[Paul Birkeland]

PJ always has more insightful thoughts about stuff like this than I do, especially since it's his design.  I'd imagine he'd specify a smaller cap if you planned to use the Speco output transformer, or something a bit heftier if you planned to use our current OT-2 or the Edcor-sourced upgrades for the older Paramours.  Something around 7uF should be fine with the 60H/OT-2.  I'd cut that value down a bit if you're planning to stick with the Speco.

 

[Paul Joppa]

PB nailed it.

 

[CentripetalMan]

PJ always has more insightful thoughts about stuff like this than I do, especially since it's his design.  I'd imagine he'd specify a smaller cap if you planned to use the Speco output transformer, or something a bit heftier if you planned to use our current OT-2 or the Edcor-sourced upgrades for the older Paramours.  Something around 7uF should be fine with the 60H/OT-2.  I'd cut that value down a bit if you're planning to stick with the Speco.

Hi Paul,

Thanks for the reply. The transformers are 4K parafeed made by ElectraPrint.

 

[Paul Birkeland]

Thanks for the reply. The transformers are 4K parafeed made by ElectraPrint.

Can you take some pictures of one next to a ruler?

 

[CentripetalMan]

Hi Paul,  I've attached the photos of the transformer.

Thanks!

 

[Paul Birkeland]

That is the same lamination size as the OT-2 we use in the SEX and Stereomour (bigger than what's in the tiny Speco), but not quite as large of a stack (fewer of those laminations in the stack).  I think 7uF should be just fine.