[Hallicrafters] HT-37 initial test

[Al Parker]

Well, it musta been too close to supper.
30/.005 = 6000, not 1500.  Seems a bit high, but ??
73,

Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 3/22/2013 4:37 PM, Al Parker wrote:
> Hi agn,
>      One other thing to do, it can be a "gotcha".  Do replace the
> selenium rectifier in the bias supply.  It will fail, if it hasn't yet.
> When it does, the final tubes will draw way too much idling current at
> all times (maybe not if the switch is in "standby", I don't remember
> now).  If that happens the primary fuse will eventually blow, if it's
> sized properly.  You will have to add some series resistance with the
> new diode, I don't remember just how big, it's not in the notes on the
> referenced page, but I may have it in my notes somewhere, as I've done
> that in one not too long ago.  As a starting point, figure you'll have
> to drop about 30 v, at maybe 5 ma., so R=E/I  or R=30/0.005 = 1500 ohms.
> 73,
>
> Al, W8UT
> www.boatanchors.org
> www.hammarlund.info