[Milsurplus] Unique BC-221 Conversion

[Richard Solomon]

Typical Mil Surplus Conversion of the 50's
and 60's ...

..."first, remove all the components"... !!

73, Dick, W1KSZ

On Wed, Oct 26, 2016 at 12:46 PM, howard holden <holden7471 at msn.com> wrote:

> His schematic appears to be incomplete. This looks like a typical
> 30's-40's MOPA diagram but he has two each controls for the osc and amp
> plates, yet there are only one cap in each. Also there are some apparent
> antenna trim controls on the top but nothing on the schematic. It goes
> straight to a link coupled output. Also there's a "plate current" bulb on
> the top, but not on the schematic.  Curious about that because the meter is
> switched between the two tubes, and there's no separate plate power-on
> switch. Looks like he only used the BC-221 cabinet, gutted the rest.
>
> The keying, yes it puts a lot of V on the key, but many early Novice rigs
> used that. As long as you keep the cathode side to the lower (hot) contact
> on the key, chances of an accidental contact are small. Lived with this
> method of keying for years. Still do on some rigs!
>
> Of course this does beg the question of what happened to the "real"
> BC-221.......
>
> Howie WB2AWQ
> On 10/26/2016 6:49 AM, Ray Fantini wrote:
>
> Not a bad looking job, like the name tags. Too bad there are no interior
> pictures.  The keying system looks to be fun having lots of high voltage on
> the key contacts but understand that’s the way things were done back then.
> One little relay would have gone a long way in helping.
>
> I just finished reading how on the old land line telegraph circuts it was
> not uncommon to run sometimes hundreds of volts and can see where that can
> get hairy.
>
>
>
> Ray F/KA3EKH
>
>
>
> *From:* Milsurplus [mailto:milsurplus-bounces at mailman.qth.net
> <milsurplus-bounces at mailman.qth.net>] *On Behalf Of *Hubert Miller
> *Sent:* Tuesday, October 25, 2016 4:51 PM
> *To:* Glowbugs <tetrode at googlegroups.com> <tetrode at googlegroups.com>;
> milsurplus at mailman.qth.net
> *Subject:* [Milsurplus] Unique BC-221 Conversion
>
>
>
> Here’s a unique “conversion” of a BC-221 frequency meter.
>
> http://www.ebay.com/itm/112174815013?rmvSB=true
>
> with a slight modification, it became a 6AG7 + 807 ham transmitter.
>
> -H
>
>
>
>
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