[Hammarlund] HQ-180A power supply question

[Robert Frost]

Craig,

I have had my HQ-180A since new and have babied it the whole time.  It 
still looks like it just came out of it's box (which I still have by the 
way).   So here's the scoop...

....The power supply does use a 0A2 regulator.
....There are two rectifier diodes that do a full wave rectification 
since the transformer has a center tap that is grounded.

Bob W7TOM

Craig Roberts wrote:

>Does anyone have a schematic for an HQ-180A (not an older 180)handy?
>
>If so, can you tell me if this receiver (the 180A) uses an OA2 voltage
>regulator?  If so, does it also use a full wave bridge rectifier with four
>diodes?
>
>The reason I'm asking is that my HQ-170A VHF was apparently upgraded by a
>former owner to incorporate several factory mods. It also, as I mentioned a
>couple of weeks ago, has a four-diode rectifier circuit and uses an OA2
>regulator, even though the schematic specifies two diodes and an OB2. I'm
>wondering if this radio's power supply was modified to match that of a late
>HQ-180A.
>
>I've downloaded the HQ-180 schematics from the BAMA, but they're early
>charts that still show depict a tube rectifier -- so I have no reference to
>the later model.
>
>Many thanks and 73,
>Craig
>W3CRR
>
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