De-emphasis. - UK Vintage Radio Repair and Restoration Discussion Forum

HoraceBatchelor · 15th Aug 2020, 1:19 pm

The cap In my Cossor 524 that i'm asking the question about is the one with the job title De-emphasis. And it is c47 in the trader service sheet. Is this cap vital, it's value is 0.002uf, and if vital or not, what would be the best equivalent replacement? Thanks.

PJL · 15th Aug 2020, 1:52 pm

It's a simple CR low pass filter to remove the 'emphasis' applied at the transmitter. Are you sure it's a paper capacitor?

HoraceBatchelor · 15th Aug 2020, 2:41 pm

Its one of those unpopular Hunts caps bearing the figure 200. I think that is what it reads as the figures are positioned on the bottom side and not very clear.

Station X · 15th Aug 2020, 3:01 pm

Replace with 2.2NF.

15th Aug 2020, 1:19 pm	#1
HoraceBatchelor Triode Join Date: Mar 2019 Location: Wigan, Lancashire, UK. Posts: 32	De-emphasis. The cap In my Cossor 524 that i'm asking the question about is the one with the job title De-emphasis. And it is c47 in the trader service sheet. Is this cap vital, it's value is 0.002uf, and if vital or not, what would be the best equivalent replacement? Thanks.

15th Aug 2020, 1:52 pm	#2
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: De-emphasis. It's a simple CR low pass filter to remove the 'emphasis' applied at the transmitter. Are you sure it's a paper capacitor?

15th Aug 2020, 2:41 pm	#3
HoraceBatchelor Triode Join Date: Mar 2019 Location: Wigan, Lancashire, UK. Posts: 32	Re: De-emphasis. Its one of those unpopular Hunts caps bearing the figure 200. I think that is what it reads as the figures are positioned on the bottom side and not very clear.

15th Aug 2020, 3:01 pm	#4
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,286	Re: De-emphasis. Replace with 2.2NF. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.