Trio Kenwood TS830S cathode resistors. - UK Vintage Radio Repair and Restoration Discussion Forum

carlos10 · 28th Feb 2023, 1:43 pm

hi
on the finals board,
wat happens if replacing the four 20ohm resistors with 22 ohm ones
the four 20 ohms in parallel =5 ohm
the four 22 ohms= 5,5 ohms
they act as fuse, is the metering not correct anymore?
carlos on6cn

mickm3for · 28th Feb 2023, 2:35 pm

Hi the metering will not be correct. you could use 2x 10 ohm double the wattage non inductive type Mick

G3PIJpeter · 28th Feb 2023, 11:27 pm

Quote:

Originally Posted by mickm3for

Hi the metering will not be correct. you could use 2x 10 ohm double the wattage non inductive type Mick

If using 'preferred values', then replacing the specified 4 x 20-ohm resistors with 2 x 22 plus 2 x 18 would give the same result (i.e. 10 ohms). That's what I did with the original badly singed cathode resistors in my TS830 and it has worked OK for several years.

Radio Wrangler · 28th Feb 2023, 11:47 pm

Two 22 and two 18 all in parallel 4.95 Ohms. all standard values.

David

carlos10 · 28th Feb 2023, 11:58 pm

david,yes its 4.95 ohm,thats close ,see if i have the 18ohm 1/2 watt resistors,never thougt of this solution,dont now why hi

G3PIJpeter · 1st Mar 2023, 9:48 am

Quote:

Originally Posted by Radio Wrangler

Two 22 and two 18 all in parallel 4.95 Ohms. all standard values. David

Don't forget that these four resistors are 'fuses of last resort' and that their wattage ratings should be as original.

carlos10 · 1st Mar 2023, 10:12 am

yes, 1/2 watts

28th Feb 2023, 1:43 pm	#1
carlos10 Pentode Join Date: Apr 2007 Location: Sint-eloois-winkel 8880, Belgium. Posts: 168	Trio Kenwood TS830S cathode resistors. hi on the finals board, wat happens if replacing the four 20ohm resistors with 22 ohm ones the four 20 ohms in parallel =5 ohm the four 22 ohms= 5,5 ohms they act as fuse, is the metering not correct anymore? carlos on6cn

28th Feb 2023, 2:35 pm	#2
mickm3for Heptode Join Date: May 2015 Location: Chatham, Kent, UK. Posts: 965	Re: ts830s cathode resistors Hi the metering will not be correct. you could use 2x 10 ohm double the wattage non inductive type Mick

28th Feb 2023, 11:47 pm	#4
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,902	Re: ts830s cathode resistors Two 22 and two 18 all in parallel 4.95 Ohms. all standard values. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

28th Feb 2023, 11:58 pm	#5
carlos10 Pentode Join Date: Apr 2007 Location: Sint-eloois-winkel 8880, Belgium. Posts: 168	Re: ts830s cathode resistors david,yes its 4.95 ohm,thats close ,see if i have the 18ohm 1/2 watt resistors,never thougt of this solution,dont now why hi

1st Mar 2023, 10:12 am	#7
carlos10 Pentode Join Date: Apr 2007 Location: Sint-eloois-winkel 8880, Belgium. Posts: 168	Re: Trio Kenwood TS830S cathode resistors. yes, 1/2 watts