Search found 3662 matches

by JR.
Sun Apr 25, 2021 12:48 pm
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1299
Views: 627266

Re: Entropy

Centrifugal pumps are simple in the principle.... But all is in the details, and there are many variations according to different needs. Pumping does require the impeller running in water. Air is the enemy. There are tricks and so callded self priming pumps, but more or less effective, if not plain...
by JR.
Sat Apr 24, 2021 8:56 am
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1299
Views: 627266

Re: Entropy

It is raining right now and I am momentarily without a sump pump in place... after it stops raining I will drop the 1/4 HP into the crawlspace with a 3/4" garden hose for output, next week I will scale up to the 1 1/4" hose. I still haven't taken the old pump top housing apart,,, I do recall air bub...
by JR.
Fri Apr 23, 2021 5:12 pm
Forum: Document
Topic: Vintage Digital Clock Circuits
Replies: 26
Views: 58188

Re: Vintage Digital Clock Circuits

I don't guess I've ever seen a VF with that many segments. The VF tube I have from NEC is about 20 segments and IIRC used parallel drive. SSL, MCI et al used gas discharge 100 and 200 segment meters that were 3 and 5 phase cathode drive. I have one or two of them that would make a pretty level mete...
by JR.
Fri Apr 23, 2021 11:49 am
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1299
Views: 627266

Re: Entropy

It seems this troublesome pump has no foot valve or this valve is bad. Don't know what that is.... OK just looked it up, a check valve on the inlet side of pump. This is a typical (cheap) submerged pump intended to sit down in a hole (well), so bottom of pump cavity is open to beneath. ( Forgive me...
by JR.
Thu Apr 22, 2021 12:02 pm
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1299
Views: 627266

Re: Entropy

The pump pulled immediately the first time, but then reverted back to reluctant priming the next times. This doesn't make much sense, one obvious difference is first time the outlet discharge pipe was empty so no back pressure. I am quickly losing interest as replacement pump arrives tomorrow. So wi...
by JR.
Thu Apr 22, 2021 8:09 am
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1299
Views: 627266

Re: Entropy

Well, you'll have a spare 1/2 HP pump. May be more reliable than brand new, new stuff. I like old stuff I repair, rather than today's junk. Can we have a picture of the hairline crack ? Sorry no hairline crack was found to photograph under closer inspection. I am still speculating that the problem ...
by JR.
Wed Apr 21, 2021 3:03 pm
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1299
Views: 627266

Re: Entropy

No permatex to be found but I did have an old tube of RTV that wasn't solid. I loaded up a bead of RTV on both o-ring races and then some more in the gap after I reassembled it. For all you kids following along from home this is not an acceptable permanent repair.... This is just some mental masturb...
by JR.
Wed Apr 21, 2021 12:01 pm
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1299
Views: 627266

Re: Entropy

OK, the bottom casing is all phillips head screws so I was able to get to the impeller. There is no visible crack, leak, or clog. 'There was an o-ring seal between the bottom housing and the pump chamber. The o-ring appears to be in good shape and there was some sediment in the area but no obvious p...
by JR.
Wed Apr 21, 2021 9:20 am
Forum: Document
Topic: Vintage Digital Clock Circuits
Replies: 26
Views: 58188

Re: Vintage Digital Clock Circuits

Back in the 80s a multiplexed a 100 segment vacuum fluorescent display for a kick ass peak/VU meter... Its a shame there was only one of those made and I don't even remember where it went.

JR
by JR.
Wed Apr 21, 2021 9:17 am
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1299
Views: 627266

Re: Entropy

:idea: Could the hairline crack be from the lightning strike ? That is my speculation.... the pump was probably running at the time of the lightning strike less than 100' away, and the aftermarket controller attached to the pump was fried. Too much of a coincidence to ignore. Saturday I will get so...