[R-390] C553 replacement?

[Barry]

I think C553 is only in the R390A.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "R-390 Mailing List" <r-390 at mailman.qth.net>
> To: "R-390 Mailing List" <r-390 at mailman.qth.net>
> Sent: Saturday, February 25, 2023 10:03:27 PM
> Subject: Re: [R-390] C553 replacement?

> A quick look at the R-390 Collins preliminary manual indicates that C-606 and
> C-608 are both rated at 100 vdcw.  Curious that C-608 has 174 volts across it
> according to the voltage table for V-607.
> 
> I did not find C553, which tube is associated with it?
> 
> Regards,
> Jim
> 
> Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy
> 
> -----Original Message-----
> From: Barry <n4buq at knology.net>
> To: John Wendler <wendlerjrv at gmail.com>
> Cc: R-390 Mailing List <r-390 at mailman.qth.net>
> Sent: Sat, Feb 25, 2023 8:52 pm
> Subject: Re: [R-390] C553 replacement?
> 
> If I'm not mistaken, Dave Medley (and others) suggest that 180v regulator issues
> in the R390 might be due to leakage in C606 and/or C608 and I think those are
> typically Vitamin Q capacitors.
> 
> Thanks,
> Barry - N4BUQ
> 
> ----- Original Message -----
>> From: "John Wendler" <wendlerjrv at gmail.com>
>> To: "R-390 Mailing List" <r-390 at mailman.qth.net>
>> Sent: Saturday, February 25, 2023 6:01:07 PM
>> Subject: [R-390] C553 replacement?
> 
>> The C553 in one of my IF modules is a Sangamo Vitamin Q capacitor, 0.01 uF,
>> 300 V.  It looks good visually and is not a Brown or Black Beauty of
>> Death.
>> 
>> What's the group experience with the reliability of the Vitamin Q caps?
>> 
>> V/r,
>> 
>> JP N5CQU
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