[Hammarlund] SP-400X and 210

[Carl]

I have a SP-100X, 200X (BC-1004), and 400. The 400X designation is when 
there is an added switch for crystals for the HFO. Most 400's were shipped 
with a cabinet and the 400X was usually rack mounted.

The 400 IF is 455kc and early production had 6F6's in both audio stages and 
then went with 6V6's

Some basic temperature compensating was added to the 400 HFO that can also 
be used with any of the earlier series as they all drift a lot on the higher 
ranges. One of those SS VFO stabilizers also works well and then a digital 
frequency readout is a nice addition.

IMO the audio has too much bass as the response is flat to well below 50Hz. 
Its also rough on speakers that arent built for it and painful with 
headphones. The output transformer is 500-600 Ohms for both the 200 and 400 
plus a 8000 Ohm winding for headphones which can actually be as low as 80 
Ohms per the manual.

The 3 front end tubes are very noisy which will limit sensitivity above 
about 12-14mc. Ive made some changes to my 400 with more to come.

ALL paper caps including those in the little bathtub cans in military sets 
must be replaced and many resistors will be well out of tolerance.

All will benefit from regulation of the HFO and BFO, either added VR tubes 
or zeners which is what I use.

All PS, military and civilian versions are interchangable including the 
SP-100.

Carl
KM1H




----- Original Message ----- 
From: "Guido" <laffitte at prtc.net>
To: <hammarlund at mailman.qth.net>
Sent: Saturday, July 21, 2012 1:11 AM
Subject: Re: [Hammarlund] SP-400X and 210


> The SP400 is similar to the SP210. One thing to take into account is that
> there are several paper caps inside the IF cans that have to be replaced. 
> If
> I remember well from the restoration of my SP210SX years ago the IF can
> covers can be easily removed without having to desolder and remove the IF
> transformer themselves. After restoration these radios work wonderfully
> well. Just make sure that all resistances are also checked.
>
> Best 73s
>
> Guido KP4FAR
>
> -----Original Message----- 
> From: Joe Connor
> Sent: Friday, July 20, 2012 6:23 PM
> To: Al Santangelo ; hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] SP-400X and 210
>
> Al:
>
>    Here's an excellent article by Al Parker describing the restoration
> process for an SP-210.
>
> http://www.hammarlund.info/SP200.htm
>
>    If I remember correctly, recapping an SP-400 is somewhat less difficult
> because I don't think you have to remove the RF Deck to get at hidden 
> caps.
> I hope someone can confirm this because I last worked on my SP-400 about 
> 10
> years ago.
>
>                               Joe Connor
>
>
>>________________________________
>>From: Al Santangelo <ve3ajm at gmail.com>
>>To: hammarlund at mailman.qth.net
>>Sent: Friday, July 20, 2012 6:14 PM
>>Subject: [Hammarlund] SP-400X and 210
>>
>>Hi guys
>>New to this list and always wanted to play with the older SPs.
>>I have a chance to obtain each of these receivers. The 400X comes with
>>the PS but is missing both audio transformers. Looks like average
>>condition, no cabinet.
>>The 210 looks complete no PS. Anyone replaced the paper caps in these
>>or other thoughts on refurbishing etc. and the variable selectivity.
>>Looks like they should produce some nice quality AM audio.
>>Thanks
>>Al VE3AJM
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>>
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