[Premium-Rx] HP355D Repairs

[John Kolb]

On Mon, 8 Sep 2003, Sam Dellit wrote:

>
> recently acquired some extra HP355D step attenuators on ebay
>
> naturally several resistors burnt out
>
> the resistors are non-standard values and half percent tolerance
> and presumably carbon composition types
> (to give the 50 ohm in/out impedances)
>
> (1) anyone out there know where to source these resistors?

Best bet is probably to calculate 2 standard values (1%) that
wehn placed in parallel, give the desired result. Maybe necessary
to buy a handful and select for exact value. 2 resistors, each
close to double the desired value best so near equal power
division.

> (2) any tips for reconnection by punching into the diecast channels?

Extra channels are provided for repair use - scrape clean of
oxide before use, but I'd prefer to crush the bad resistor
and wire to the existing leads.

John