[Amps] Fw: 3cx3000A7 driver

[m.ford]

----- Original Message ----- 
From: "m.ford" <k1ern at pioneerwireless.net>
To: "crawfish" <crawfish at surfmore.net>
Cc: <amps at contetsting.com>
Sent: Sunday, July 23, 2006 6:21 PM
Subject: Re: [Amps] 3cx3000A7 driver


>
> ----- Original Message ----- 
> From: "crawfish" <crawfish at surfmore.net>
> To: "Karl-Arne Markström" <sm0aom at telia.com>; <g3rzp at g3rzp.wanadoo.co.uk>; <amps at contesting.com>
> Sent: Sunday, July 23, 2006 2:33 PM
> Subject: Re: [Amps] 3cx3000A7 driver
>
>
> I remember that Natioanl had a transceiver called the NCX-1000, which
> supposed ran a kW input on SSB. This was  before I got into ham radio. Did
> it really deliver 600 watts output as it should have, and was wondering why
> it was never duplicated by anyone else?
>                                  Joe W4AAB
> snip
>
> I sold my NCX-1000 a few years ago to K1GUP for his extensive boatanchor museum.
> Also included were many spares including another half assembled chassis and enough
> parts to finish it. I obtained the units from the last owner of National in 1986 at about
> the same time I removed the Rohn 25 foldover from the factory roof.
>
> Behind the factory, across from the loading dock there stood a small storage shed
> packed with NCL-1000 tranceivers in various stages of completion. Most had the
> driver tubes installed but no final 8122. There were boxes full of completed  boards
> and spare parts but no cabinets. The owner said "take your pick Mike they will never
> get finished anyway". So I did.
>
> I finished assembly of a complete unit and had the thing working albeit not up to the output
> one should see. As years went by I swapped out boards and parts and just about did
> everything I could think of to get it to bark. In each case all the individual statges would
> meet their output level but just barely. The sum of all the low end specs resulted in an
> output of no more than 300 Watts in the tune position.
>
> Years later the rest of the stufff got auctioned off and someone was selling completed
> units for a while. The real deal has an analog tuning dial. The reworked and not assembled
> by National have a digital readout in place. Probably because the dials were not found.
>
> From my experience building one I can say that there was a major problem with thru eyelets
> on the front end boards and the final needed more drive. I did install an Anzac AM-109 as a
> predriver and it woke up the final but I removed it when it went to the new owner who actually
> uses it on a local AM net. It sounds good.
>
> If you need specs or other info contact K1GUP. I gave him all the manuals and my notes.
>
> Mike  k1ern
>
>