Mike Tomlinson wrote in message
...
In article , N_Cook
writes

This green thermistor limiter 10 deg C over ambient with no throughput
and
20 deg C over with 0.4 amp mains with amp driving load.

Bit warmer than I would be comfortable with.

--
Mike Tomlinson


Odd you say that. The next amp I looked at, this time mixer amp but also
300W and toroid Tx. Owner bought knowing 2 of the 8 channels were duff and
used as such for some years. He now needs all 8 ch .
Before he owned it , it must have been dropped and broke the awkward
size/shape mains switch. So someone spade jumpered the leads and covered
with heatshrink, leaving un-blanked off hole in chassis. Under his
heatshrink and touching the ordinary mains wire sleeving is an inrush
thermistor. Black , with 0.8mm leads, marked SG 130, 3.2R cold, 0.8R 20 sec
of soldering iron barrel. Presumably originally fixed to the sw and
unsupported other lead other than cable tie further down the cable loom.
Hopefully originally there was some woven glass sleeving over the thermistor

data for SG130 RTI Surge Guard, 0.07 ohms at 7 amps max , 2.5R at 25 deg C
27 joules rating for a 15 x 6.3 mm black (body radiator?) lump and .8mm
leads for anyone who can convert to temperature (not on the RTI datasheet)