[R-390] Sigmapert 26Z5W's and otherness

[Ken Harpur]

Hi Kurt,

Yes agreed, I was very annoyed with myself when I realised what I had done but I can't turn back time. What I thought was a harmless experiment  ended up being a valuable lesson...nothing worse than being hurt in the wallet!

I like your products and plan to purchase more, which brings me to a question. Are you planning on doing a SS module for the OA2 regulator?

Kind regards,
Ken


On 21/09/2013, at 10:15 AM, sigmapert <sigmapert at gmx.de> wrote:

> Hi Ken,
> 
> when handled appropriate solid state devices are not fragile. But if you e.g.
> would remove or insert the CPU in a running computer you certainly wouldn't be
> surprised when the CPU thereafter is scrap.
> 
> Each of my 3TF7 replacements is accompanied by a brochure. Point 1 of the
> therein contained replacement procedure states: 'Switch the receiver OFF'.
> 
> Using a LM 317 in current mode or a 7812 voltage regulator produces considerable
> heat requiring a bulky heat-sink. No chance to construct a true plug-in device.
> 
> One remark regarding the use of modern components in vintage gear. IMOH
> acceptance depends on at least 3 criteria:
> 
> 1) the technical data have to be BETTER than the original ones
> 
> 2) the modification has to be fully reversible
> 
> 3) the replacement should optically nicely fit into the vintage gear
> 
> Best Regards & vy 73
> 
> Kurt - DH3PJ
> 
> mailto:sigmapert at r-390a.eu
> 
> 
> am Freitag, 20. September 2013 um 23:30 schrieben Sie:
> 
>> Good morning List,
> 
>> I just had a look  for the 26Z5W replacements and they are all sold already. Hopefully he'll have some more soon.
> 
>> Currently I have his C603 and C606 capacitor replacements in two of my radios
>> and will shortly get another set for my other radio. They are indeed nicely made. Very elegant indeed...
> 
>> Until a few nights ago I had one of his 3TF7 replacements which was working
>> well...until I made the mistake of switching back to the original glass 3TF7
>> with the receiver powered on. You all are probably wondering why I even
>> thought of it...I was trying to track down a noise issue so I did a quick A/B
>> test. Now the unit is non-functional so I'm back using the glass 3TF7. So
>> please learn from my mistake! The replacement 3TF7 seems to be electrically
>> fragile in that regard. BTW no...that is NOT a criticism, just an observation.
>> I built a SS regulator for the 3TF7 some time ago using an LM-317 and that
>> thing is very robust so I'm probably going to go back to using that.
> 
>> Kind regards,
>> Ken
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