[time-nuts] Curious, how many t-nuts have 5065A

ewkehren ewkehren at AOL.com
Sat Feb 24 09:49:44 EST 2018


Old color and a little expensive only one partial pictureBert Kehren


Sent from my Galaxy Tab® A
-------- Original message --------From: Bob kb8tq <kb8tq at n1k.org> Date: 2/24/18  9:30 AM  (GMT-05:00) To: George Atkinson <robertg8rpi at virginmedia.com>, Discussion of precise time and frequency measurement <time-nuts at febo.com> Subject: Re: [time-nuts] Curious, how many t-nuts have 5065A 
Hi

The “pickup only” part of the deal would be a bit of an issue for some of us :)

Bob

> On Feb 24, 2018, at 5:46 AM, George Atkinson via time-nuts <time-nuts at febo.com> wrote:
> 
> There is one on UK ebay at the moment but its not being given away. From the one partial photograph it looks a bit rough.
> 
> https://www.ebay.co.uk/itm/HP-5065A-Rubidium-Frequency-Standard/183057846558?
> 
> Robert G8RPI.
> 
>> 
>>    On 24 February 2018 at 10:02 John Miles <john at miles.io> wrote:
>> 
>>>> 
>>>        Hi
>>> 
>>>        Well, if anybody else is “giving away” 5065’s I’d certainly be willing to
>>>        “accept”
>>>        one :)
>>> 
>>>        Bob
>>> 
>>>> 
>>    Be careful what you wish for. :) The unit Pete is talking about is a 1969-era model, in nice overall shape but with the usual bad capacitors on the oven controller board. The lamp oven winding should be about 50 ohms cold, but is closer to a dead short. It will take a LOT of work to restore to working condition.
>> 
>>    The failed controller ran long enough to smoke a 1.5-ohm 1W resistor, 1N400-something diode, and eventually the 1A line fuse ( http://www.ke5fx.com/5065A_A11_sm.jpg ). Needless to say the lamp PCB looks like something out of Fukushima. It'll need to be rebuilt from scratch after rewinding the heater.
>> 
>>    Seriously -- anyone with a 5065A who hasn't checked/replaced the caps on A11, don't let this happen to you. They aren't making any more of these puppies. If the caps on that board are original, don't bother to check them, just replace them, as Luciano suggests at http://www.timeok.it/hp5065a-corner-3/. No need for exotic parts, just put in whatever you have that is somewhere close to the original values.
>> 
>>    Not a bad idea to verify the ESR of the new parts you're installing as well.
>> 
>>    -- john, KE5FX
>>    Miles Design LLC
>> 
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