[R-390] R-390A Test Equipment

Thu May 31 10:48:51 EDT 2018

> On May 31, 2018, at 10:10 AM, Barry <n4buq at knology.net> wrote:
> 
> GR 1806A.  Ooooh!  I've never owned one but those look NICE.  Just got another HP410B to add to the VTVM collection but now am wanting the GR…

Barry,

I have owned at least one HP 410 but I’m not sure I still to after a disaster.

If you EVER get a chance to buy a GR 1806, DO IT.  (I see none on eBay now) It has a number of features and refinements that make it a delight to operate.  Among them are:

- a BIG meter scale (moving pointer, of course, no digits!)
- a simplified scale factor scheme - all scales are the same - no having to decide which scale to use (the lowest AC range has a separate scale.)
- very high input impedance (can operate open grid input, but that’s seldom needed.)
- built in AC probe (OMIGOD, the included ceramic tube costs well over a hundred dollars!)
- DC and AC zero knobs on the front panel

More later (If you know of an old wood cased 1800A for sale, let me know - I lost two in the disaster and had not overhauled either one.)

Roy Morgan
k1lky68 at gmail.com

> 
> 
> Thanks,
> Barry - N4BUQ
> 
> ----- Original Message -----
>> From: "Roy Morgan" <k1lky68 at gmail.com <mailto:k1lky68 at gmail.com>>
>> To: "Perry Sandeen" <sandeenpa at yahoo.com <mailto:sandeenpa at yahoo.com>>
>> Cc: r-390 at mailman.qth.net <mailto:r-390 at mailman.qth.net>
>> Sent: Thursday, May 31, 2018 8:53:46 AM
>> Subject: [R-390] R-390A Test Equipment
>> 
>> Perry,
>> 
>> Just rand into this old email from you.
>> 
>> I just got a Tek 547 (to replace one lost in a disaster) and look forward to
>> working on my three R-390A’a that did survive the disaster.  One is missing
>> the IF module, and I think it was lost in the disaster, so I will likely be
>> looking for a replacement.  If you have one for sale, let me know.
>> 
>> I have three R-390A’a here.  One is an EAC, and I look forward to getting at
>> least two running nicely.  They’ve been “in storage” for some. Years now.
>> 
>> I also got with the 547 a Fluke 8010A DMM.  These seem to bring low money on
>> eBay now - only four digits (!) but it has all the functions I’d ever need
>> for work on the R-390A’s.  (None of us need 6 or 8 digits of
>> voltage/resistence readout!)
>> 
>> So would a GR 1800A VTVM, and I hope to find another one of those to rebuild
>> also. (I do own a GR 1806A, the very best VTVM I have ever used!).  I did
>> lose a TS-505, that was very useful.
>> 
>> 
>> Roy Morgan
>> k1lky68 at gmail.com <mailto:k1lky68 at gmail.com> <mailto:k1lky68 at gmail.com <mailto:k1lky68 at gmail.com>>
>> 
>> 
>> 
>>> On Oct 19, 2016, at 5:53 PM, Perry Sandeen via R-390 <r-390 at mailman.qth.net <mailto:r-390 at mailman.qth.net>
>>> <mailto:r-390 at mailman.qth.net <mailto:r-390 at mailman.qth.net>>> wrote:
>>> 
>>> List,
>>> There are two tools that make servicing the R3XX receivers much easier.
>>> First is a DVM.  There good ones available that are in the $50 ranged. (If
>>> you're really, really, really cheap then Harbor Freight has some usually
>>> on sale for $4 or less.)
>>> If one want to do more serious work and O'scope is the only way to go.
>>> I got a Tek 2445 for $180 at a hamfest several years ago.There are loads of
>>> them on Ebay that are <100 MHz bandwidth.  Some have a DVM value that is
>>> on the screen.
>>> For a bit more ($150 to $200)  one can get older 465's with a much higher
>>> band width.
>>> IMNSHO, if you can afford R3XX receivers, an O'scope is necessity.
>>> Regards,
>>> Perrier
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