[volt-nuts] Solartron 7081 With Bad WR057 Diode

[Charles Black]

Littlediode is no more. The only other ebay seller has been caught 
re-branding and selling used as new. I have been looking at pico amp 
reverse cxurrent diodes that are still being sold and have not founds  
any that favorably compare with the DPAD1. The DPAD1 is only being sold 
by one source as far as my research has gone today. It is Linear 
Systems/micross. They are a bit dear at $4.35US each but could be used 
to upgrade the 7081's performance a small amount. I was ordering them 
last night and all was going well until they overcharged ($20US) for UPS 
ground. It's hard to trust a company that does that!

David, I want to thank you for your 7081 information  on your web site. 
I used the troubles you had with your 7081 repair as a starting point 
for my first repair and it saved me a lot of time.

Nigel, thanks for letting me know aboutlittlediode and your experience 
with them.

Charlie

On 10/31/2014 4:30 AM, Nigel Clarke via volt-nuts wrote:
> I bought from Little Diode around 10 years ago, a variety of RF
> transistors similar to and including 2N3866 with the specific intention of  comparing
> them for suitability in LF/HF active antennas.
> However all the devices they supplied looked to have been rebranded from
> the same generic stock, I'd had some experience of this in the past but it
> still  took a LOT of effort before I finally got past the evasive responses
> and  they admitted this was true, which of course made any comparison pretty
> pointless.
>   
> They didn't refer to them as "generic", can't remember what expression they
>   did use now in their initial responses but remember it wasn't something
> I'd come across before, but there were certainly no indications at the  point
> of sale that these weren't original manufacturer's branded stock.
>   
> Such rebranding and subterfuge was common amongst some at least of the
> aftermarket electronic valve suppliers in the late 1960s, a bog standard device
>   going in one door could come out another as the ruggedised version,  for
> example, and much more expensive, and it would seem similar  practices lived
> on.
>   
> I wouldn't touch them again with the proverbial barge pole, although I have
>   to accept others may have had better experience.
>   
> Regards
>   
> Nigel
> GM8PZR
>   
>   
>   
>   
>   
> In a message dated 31/10/2014 10:49:12 GMT Standard Time,
> david.partridge at perdrix.co.uk writes:
>
> I might  be worth asking eBay vendor LittleDiode, they are the eBay shop
> for  LittleDiode Components ...
>
> Regards,
> David Partridge
> -----Original Message-----
> From: volt-nuts  [mailto:volt-nuts-bounces at febo.com] On Behalf Of Charles
> Black
> Sent: 31  October 2014 00:09
> To: volt-nuts at febo.com
> Subject: [volt-nuts] Solartron  7081 With Bad WR057 Diode
>
> My Solartron 7081 has  a bad WR057 diode  that needs to be replaced. It's a
> three terminal device that looks like two  silicon diodes in parallel.
> It was making the meter read about 10.1V with  a 10V input. Luckily it was
> temperature sensitive and was easy to find with  freeze mist. Removal caused
> a shorted input to be about 2.5 microvolts high  and a little noisy. I've
> not been able to find this device on the internet but  thought that someone
> here might have seen this thing  before.
>
> Charlie
>
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