1K ohm Pin5 to Pin6 resistor purpose/quality?

by vegaseddoc Sat May 07, 2011 7:53 pm

vegaseddoc: Posts : 12
Join date : 2009-11-21

Post n°1

1K ohm Pin5 to Pin6 resistor purpose/quality?

by vegaseddoc Sat May 07, 2011 7:53 pm

Any advantage to changing this particular resistor? Does the value have to be exactly 1K? The reason I ask is that I broke one of the originals while maneuvering some K75-10 coupling capacitors into the chassis. Please don't ask how (i.e. butter fingers). I was going to buy some new ones but I found some Shinkoh 1.2K tantalum 2 watt resistors in my stash. Can I use these or should I just buy some new metal-film resistors. Any opinions on this topic?

Jason

by **Bob Latino** Sat May 07, 2011 8:31 pm

Bob Latino

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Join date : 2008-11-27
Location : Massachusetts

Post n°2

Re: 1K ohm Pin5 to Pin6 resistor purpose/quality?

by Bob Latino Sat May 07, 2011 8:31 pm

That "grid stopper" resistor doesn't have to be exactly 1K ... You could use a 1.2K tantalum 2 watt resistor in there. I use a 1K 1 watt carbon film resistor there. Since pin 6 is not used on the EL34 family of tubes, pin 6 is just used as a tie off point to carry the audio signal over to pin 5 (the control grid) through that resistor. That resistor is in there, by the way, to prevent the tube from oscillating at some frequency and/or the possibly of the tube transmitting (unwanted) RF.

Bob

by vegaseddoc Sat May 07, 2011 9:56 pm

vegaseddoc

vegaseddoc: Posts : 12
Join date : 2009-11-21

Post n°3

Re: 1K ohm Pin5 to Pin6 resistor purpose/quality?

by vegaseddoc Sat May 07, 2011 9:56 pm

Thanks. I switched them to the 1.2k resistors and the system works fine.

Jason

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1K ohm Pin5 to Pin6 resistor purpose/quality?