Pilot T 405 replacement caps. - UK Vintage Radio Repair and Restoration Discussion Forum

Daventry 5XX · 8th Jun 2012, 4:35 pm

Hi All,

I'm in the process of renovating a 1940 Pilot T 405 and have come across some Hunts caps which,in my limited experience seem to have an unusually high DC working voltage.

Working off Trader Sheet no. 492,they are as follows:

C9 AF coupling to V3 Triode. (0.001).
C11 Part of variable tone control. (0.01)
C12 V3 triode to V4 AF coupling. (0.01)

They are all rated at 2000v.

Can I safely use 1000v. or 1500V. replacements as these seem to be much easier to source or must I stick rigidly to the original spec.?

Your thoughts please.

Alan

Steve_P · 8th Jun 2012, 4:41 pm

Yes, you can! No problem, as the set only produces about 300v maximum anyway. The 630v ones you can get will do!

Cheers,

Steve P.

Daventry 5XX · 8th Jun 2012, 4:45 pm

Thanks Steve,
Thats the reply that I was hoping for.
Alan

Daventry 5XX · 8th Jun 2012, 4:48 pm

Why did they use such overated caps in the first place,could it be that at the height of the war the correct ones were in short supply?
Alan

Steve_P · 8th Jun 2012, 4:57 pm

Either that or they were cheaper!

Cheers,

Steve P.

8th Jun 2012, 4:35 pm	#1
Daventry 5XX Pentode Join Date: Dec 2011 Location: Daventry, Northamptonshire, UK. Posts: 163	Pilot T 405 replacement caps. Hi All, I'm in the process of renovating a 1940 Pilot T 405 and have come across some Hunts caps which,in my limited experience seem to have an unusually high DC working voltage. Working off Trader Sheet no. 492,they are as follows: C9 AF coupling to V3 Triode. (0.001). C11 Part of variable tone control. (0.01) C12 V3 triode to V4 AF coupling. (0.01) They are all rated at 2000v. Can I safely use 1000v. or 1500V. replacements as these seem to be much easier to source or must I stick rigidly to the original spec.? Your thoughts please. Alan

8th Jun 2012, 4:41 pm	#2
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Pilot T 405 replacement caps. Yes, you can! No problem, as the set only produces about 300v maximum anyway. The 630v ones you can get will do! Cheers, Steve P. __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

8th Jun 2012, 4:45 pm	#3
Daventry 5XX Pentode Join Date: Dec 2011 Location: Daventry, Northamptonshire, UK. Posts: 163	Re: Pilot T 405 replacement caps. Thanks Steve, Thats the reply that I was hoping for. Alan

8th Jun 2012, 4:48 pm	#4
Daventry 5XX Pentode Join Date: Dec 2011 Location: Daventry, Northamptonshire, UK. Posts: 163	Re: Pilot T 405 replacement caps. Why did they use such overated caps in the first place,could it be that at the height of the war the correct ones were in short supply? Alan

8th Jun 2012, 4:57 pm	#5
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Pilot T 405 replacement caps. Either that or they were cheaper! Cheers, Steve P. __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?