Fw: RE: [HBR] Restoration info

[DW Holtman]

Kees,

I have had several 2-B over the years. I really don't think you are going to 
make much improvment in such things as Receiver sensivity, noise floor, 
selectivity ( without adding crystal filters). If I was going to try to 
improve on a 2-b, I might build a digital VFO using DDS technology. You 
would have a very nice 1.5 to 30 MHZ  shortwave receiver. For what it is 
worth.

Best,
DW Holtman



----- Original Message ----- 
From: <windy10605 at juno.com>
To: <hbr at mailman.qth.net>
Sent: Wednesday, July 27, 2005 7:34 PM
Subject: Fw: Fw: RE: [HBR] Restoration info


> It's a 100 page Word document which I will distribute via email once I
> get a list of names together. You can print it or file it as you wish. I
> also have the 80 or so page RSGB Receiver document by G2DAF as a Word
> document for those interested. They are both on my CD but occupy too much
> space on the web site. They are both great pieces of info to have if you
> are working on quality tube receivers.
>
> Right now, a friend of mine and I are working to improve the Drake 2B
> receiver. Triple conversion without the typical string of IF stages. If
> you can find one cheap, buy it. I've always thought the 2B was a great
> example of a commercial tube type HF receiver of the early 60s timeframe
> which is physically compact, sensitive (0.5uV or better), selective (good
> permeability tuned passband), simple slide switches, multiple Hi-Z AVC
> points, copper plate chassis (there are no "bad grounds" to tube
> sockets), screws vs rivets, low power (less than 40W), "low" voltage
> (less than 180VDC) and uniquely efficient design (have you seen the
> outstanding use of vertical terminal strips ? super simple graticule
> adjustment, etc). It also offers the distinct "ease of use" advantage of
> bandswitching and crystal converters. Still an excellent design in this
> day and age. Maybe some of you have some input on improving that design ?
>
>
> 73 Kees K5BCQ
> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
> there is also a mirror (faster response)at http://k5bcq.edebris.com/
>
>
> Retrieve reflector archived data via 
> http://mailman.qth.net/mailman/listinfo/hbr
>
>