[ARC5] Signal Generator Selection

[CARL HUETHER]

I picked up a HP-606A about 30 years ago to give the URM-25D a rest while I overhauled it. After a few weeks it started acting up and after removing the case found a few 12B4A's running red. All the PS electrolytics were leaky. After a full overhaul of those and some other parts and tubes as needed and a good alignment it worked fine but I felt it ran too hot on my 123VAC line and a small 12V bucking transformer was added. Since then it is very stable after a short warm up even on 6M. Picked up another a few months later and did the same to give the HP-8640B a rest from regular use due to its various potential problems and use it sparingly above 65 MHz.

The URM-25D is on another bench for tube auto radios and consumer BCB and Short Wave tube radios such as Zenith, Philco, RCA, etc from the 30-40's.

The 606A's are good enough even for overhauling HRO-500's with small counters sitting on top, the absolutely low phase noise is wonderful to have.

Carl

>     On 05/09/2021 6:33 PM J Mcvey via ARC5 <arc5 at mailman.qth.net> wrote:
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>     The HP8654 is a bit long in the tooth, but you can't beat that deal for $10 !!
>     says 2% frequency accuracy after warmup. You can Pair it with a good frequency counter to make your life easier...
>      
>     On Saturday, May 8, 2021, 5:35:06 PM EDT, Robert Eleazer <releazer at earthlink.net> wrote:
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>     I have an HP-8654A signal generator that covers 10MHZ - 550MHZ.  I paid $10 for it on ebay and was able to arrange for a local pick-up.  It works very well, and has both AM and FM modulation built in, but the power output meter gets a bit erratic.  Also, you really need a digital frequency counter to use with it since the "slide rule" tuning can't be read with much accuracy; my Tek 2236 scope does well for that up to about 100 MHZ
>      
>     I also have a URM-25F.  I bought it at a hamfest for $5.  It looked very scruffy but put out a nice clean stable signal - that could not be adjusted.  Turned out that it was simply a matter of the tuning shaft getting loose from the tuning cap.  Superglue fixed that, and aside from needing a small bit of recalibation on a couple of the bands, I am sure it'll do good job.
>      
>     I have two URM-127 audio signal generators and they work fine.
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>     I have an HP-606A.  It blew out the power supply and one of the panel meters a while back, and that required quite a bit of rebuilding.  I guess it works now but I'm a bit scared to turn it on.
>      
>     Wayne
>     WB5WSV 
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