[Hallicrafters] Re: [Boatanchors] simple transmitter using the1625 tube

[Carl]

----- Original Message ----- 
From: "Roger (K8RI)" <hallicraftersgroup at rogerhalstead.com>
To: "Carl" <km1h at jeremy.mv.com>
Cc: "Hallicrafters" <hallicrafters at mailman.qth.net>
Sent: Tuesday, November 18, 2008 12:18 AM
Subject: Re: [Hallicrafters] Re: [Boatanchors] simple transmitter using 
the1625 tube


> Carl wrote:
>>
>>
>>> That was IIRC just about the time CB was getting under way and I 
>>> don't think "home brewing" was very common <:-))
>>
>> Au contraire. Many first pass CBers were upset and protesting hams 
>> and it took the FCC and ARRL together to get some of the 100W
> In 59 or there abouts we moved the Midland Airport from basically what 
> is now the center of Midland to *way* out in the sticks to the NW. 
> This was really rural being either farm land or swamp. There were few 
> CBers in the area and home building was pretty much hams only. That 
> airport is now surrounded by subdivisions and a mall.  Just pick out 
> Midland on Google Earth.  I brought it up to look at the airport and 
> my plane was setting on the ramp in front of the hangar with the white 
> 4-Runner on the taxiway.  However the next time I brought it up I see 
> the 4-Runner almost to the hangar and no plane out front. At least it 
> does show our new terminal building and EAA Education Center.
>
> The resolution isn't quite good enough to see the antennas out here at 
> 521 Clyde road and that part is older as our driveway isn't paved yet 
> so it's at least 3 years older than the one of the airport.
>> to KW rigs off 11M. I had 2W1949 issued and ready for the first day 
>> of CB with a DX-100. In the NYCLI area 11M was an active mobile band 
>> that didnt get clobbered by QRM as bad as the much more popular 10M 
>> band. This was the peak of Cycle 19 and 10 almost never closed.
>>
>> I dont remember many Twoers being in use in the early 60's. ARC-3's , 
>> ARC- 5's plus SCR 522's were pretty common as well as Gooney Boxes. I 
>> had a HB 2E26 on  2M and later an 829B rig. I went SSB around 65-66 
>> with HB RX/TX converters driven by a 10B. A 10A drove 6M versions.
> Two of the locals build up phasing sideband generators using ARC5s as 
> drivers.  One had a 304TL final and I don't remember what the other 
> had, but both of them had SSB running on 6 and 2 by early 61. I 
> remember after code class we'd walk across the parking lot to "jake's 
> place" (don't remember his call) and operate openings on 6.
>
> By the mid 60's the HT37 was popular.  We moved from Midland back to 
> Breckenridge MI in 60 and I had traded the HT-37 for the HT-44/SX-117 
> combo by then..
>
> I still remember the 6C21 I was running on 75, 40 and 20.  Real bear 
> to neutralize IIRC.   I saw a pair of them running PP with a big tall 
> copper pipe hairpin. That thing must have been 4' tall.  From the 6C21 
> I built up a pair of 813's in GG .  I used the circuit in the hand 
> book for the single band amps, but added a B&W band switching tank 
> coil.
>> To this day I still do a lot of homebrew, from tubes to microwave SS.
>>
> I work with the antennas and computers and do plan on building up 
> something heavy duty for all bands.  I like the looks of the 4CX-2500, 
> but haven't seen the IM products for it under normal operating 
> conditions.


Use a YC-156, it will be the last amp you will ever need. At 100W drive 
and modest HV it will be legal and impossible to hurt. Its a 3CX15000B7 
internals with a 3CX5000A7 anode cooler. That tube is available as full 
output medical pulls at less than an a 8877 pull. IMD is superb from the 
SA plots Ive seen; as would be expected from a tube developed for 
medical use. Like down in the -50dB range at 1500W and in the 40's at 
5KW. No socket, the grid flange bolts to the chassis. Low filament 
requirements.

Use a Class A ricebox as a driver otherwise its wasted. (;

Ive the tube and all the other expensive parts to build one. Just a 
matter of reconfiguring the station and racks so I can share and use the 
2M and 222 mHz  3KV 1.5A CCS PS. Thats a winter long project the way 
everything sorta just grew around here!

The AM stations and amp/modulator racks as well as the vintage SSB gear 
will have to move to another part of the basement. With a HT-9 in the 
que for restoration thats another heavyweight to fit in.

Ive been promising myself a total rebuild here for at least 10 years. It 
will probably mean substantially less operating for several months also.

Carl
KM1H

>
> 73
>
> Roger (K8RI)
>
>> Carl
>> KM1H
>>
>>
>>
>>
>> ______________________________________________________________
>>
>
>