[Heathkit] SB-610 Resistor & Mica

[Jim Brannigan]

Carl,
Sounds like someone ran 2KW into a bad load.
The 7.5 pf cap is part of a rough attenuator circuit.  10pf should be fine.
Same with the ceramic resistor.

Jim


> Boy i've got a doozer to fix up.
> Some fried parts.
> How do they do it ?
> A  33k  1 watt resistor coming off the coax connector on the back of the 
> unit
> with a 7.5pf mica strapped across it going to pin # 3  6BN8 tube in the 
> Clamper circuit (V1C).
> Both Fried.. Smoked .... perhaps somebody tried a couple kws going into 
> it..
> So looking on the Mouser website for replacements of the 33k & 7.5pf.
> Mouser  doesn't have the standard old Carbon Composit resistor in that 
> value,
> but does have a " Ohmite brand - ceramic composition" resistor.
> Direct subsititute or keep looking ?
> Whats the difference ?
> Mouser doesn't have a 7.5pf mica but does have a 10pf mica - closest they 
> have.
> 10pf suitable or keep looking & suggestions ?
> Thanks guys..
> 73s
> Carl, k4zrd