1K ohm Pin5 to Pin6 resistor purpose/quality?
- Posts: 15
Join date: 2009-11-21
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?
- Posts: 2052
Join date: 2008-11-26
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.