I have acquired an RX01 dual drive set from a VAX780 (RX01W-VA). I am
converting it to fit in my PDP-8 rack.
I removed the VAX cabinet frame.
I have the front panel but I need the following parts:
IMC PEWEE BOXER 80mm fan PWS2107FL-1000 cooling fan (this unit has an
individual fan for each
> The terminal posts are aluminum, and can develop an oxide
> layer that prevents good contact.
>
> Removing and replacing them might improve the contact.
I have experienced this personally with TO-3 regulators, too. I had a bunch of
triple voltage Power One linear supplies that would
On 1/7/22 2:21 PM, Rob Jarratt via cctalk wrote:
Weirdly, the whine has disappeared. This is after I put the suspect capacitors
back in. Because I had previously removed them for reforming, I wonder if one
of them was not properly screwed in?
The terminal posts are aluminum, and can develop
I never had this problem with an H744 power regulator, but once I had a
horrible intermittent problem in the RK05 power supply where the caps
were 'wafting in the breeze' of the fan.
Metal fatigue had created almost microscopic cracks around the part of
the land where the screws attached,
Weirdly, the whine has disappeared. This is after I put the suspect capacitors
back in. Because I had previously removed them for reforming, I wonder if one
of them was not properly screwed in?
Regards
Rob
> -Original Message-
> From: cctalk On Behalf Of Jay Jaeger via
> cctalk
>
On 1/6/2022 7:03 PM, W2HX via cctalk wrote:
My 2c. I am not familiar with a "whine" but certainly a "hum." Sometimes if a power
supply has seen a lot of heavy load over its lifetime, the heat generated can begin to do things to the
transformer. And once that heat has done its "thing" to the
According to www.rcaselectron.com RCA made 9, 256, 1024 and 4096 bit
versions of the Selectron tube.
I don't know if any of them other than the 256 bit made it into production.
4096 Bit Selectron Pics http://www.rcaselectron.com/sel4096.html (4 by 1024)
1024 Bit Selectron Pics
On 07/01/2022 02:39, Jon Elson via cctalk wrote:
> Yes, the 2nd unit is running at 5 KHz, clearly explaining the noise.
> Possibly there is a bad flyback diode, or something causing the
> different waveform.
>
That would be D5 I guess? I did do some checks in this area but I can't
remember if I
