- Marantz Model 19 Scope - 5 Updates
- POTS Telephone Block - 5 Updates
| three_jeeps <jjhudak@gmail.com>: Apr 29 10:28AM -0700 > What you really need is a Fein cutter with an L shaped blade. (they are normally used to cut windshields out of cars) > Anyway, thanks in advance for anything useful on this matter. It makes a big difference in the value of the unit. >Have you tried boosting the filament voltage ? For one it is the best way to extend the life of a CRT, rather than rejuvinating. I wouldn't recommend that for a CRT unless it was in a TV, the color CRTs pull quite a bit of current and guess where it all comes from - the cathodes. A common trick to boost filament voltage as well as grid voltage was through the use of aftermarket transformer 'CRT boosters'...Basically a dongel that was inserted between the crt socket and the crt pins. Been so long, I forget how they were sized, and am sure you would be hard pressed to find one nowadays... |
| John Robertson <spam@flippers.com>: Apr 29 10:50AM -0700 On 2019/04/29 10:28 a.m., three_jeeps wrote: >> Anyway, thanks in advance for anything useful on this matter. It makes a big difference in the value of the unit. >> Have you tried boosting the filament voltage ? For one it is the best way to extend the life of a CRT, rather than rejuvinating. I wouldn't recommend that for a CRT unless it was in a TV, the color CRTs pull quite a bit of current and guess where it all comes from - the cathodes. > A common trick to boost filament voltage as well as grid voltage was through the use of aftermarket transformer 'CRT boosters'...Basically a dongel that was inserted between the crt socket and the crt pins. Been so long, I forget how they were sized, and am sure you would be hard pressed to find one nowadays... These were a simple step-up auto-transformer designed for 50/60Hz. I have one or two lying around my shop and any old radio/TV museum would have a pile of them I'm sure. John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| Fox's Mercantile <jdangus@att.net>: Apr 29 01:01PM -0500 On 4/29/19 12:50 PM, John Robertson wrote: > These were a simple step-up auto-transformer designed for 50/60Hz. I > have one or two lying around my shop and any old radio/TV museum would > have a pile of them I'm sure. That's all well and good, but those had one of 4-5 common TV picture tube plug/socket pairs. I seriously doubt you could find one with the matching connectors for a bastard CRT. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
| three_jeeps <jjhudak@gmail.com>: Apr 29 11:48AM -0700 >That's all well and good, but those had one of 4-5 common TV picture tube plug/socket pairs. I seriously doubt you could find one with the matching connectors for a bastard CRT. I just looked on E-bay - a number of crt boosters are available. One would have to compare pinouts/sockets (for location & form factor) to see if they match. In the event they didn't match, one could break apart the sockets to expose the crimped wires and then individually mate them to the pins on the crt (and the original socket as well). It would save a little time as compared to rolling your own. |
| tabbypurr@gmail.com: Apr 30 03:54AM -0700 On Monday, 29 April 2019 19:48:36 UTC+1, three_jeeps wrote: > matching connectors for a bastard CRT. > I just looked on E-bay - a number of crt boosters are available. One would have to compare pinouts/sockets (for location & form factor) to see if they match. In the event they didn't match, one could break apart the sockets to expose the crimped wires and then individually mate them to the pins on the crt (and the original socket as well). > It would save a little time as compared to rolling your own. With most TVs it's easier to put an extra turn on the LOPTF NT |
| "J.B. Wood" <arl_123234@hotmail.com>: Apr 29 01:05PM -0400 Hello, and my apologies for not a repair query but since this ng seems well attended - In the old days of copper-wire analog phone service, on Western-Electric (Ma Bell) residential phone installations, the twisted-two wire outside plant phone line first encountered a terminal block (usually in the basement/laundry room or garage) inside the house. All the phone extensions in the home were connected to that block which also provided a third terminal with a wire that was earthed (run to a clamp on a metallic water pipe). The yellow wires from the phone extensions were connected to the earthed terminal. The black wires from the phone extensions if not used were usually just clipped short or coiled around the gray outer jacket of the 4-wire line. Does anyone know if this terminal block provided an internal lightning arrestor of some sort? Thanks for your time and comment. Sincerely, -- J. B. Wood e-mail: arl_123234@hotmail.com |
| Fox's Mercantile <jdangus@att.net>: Apr 29 12:18PM -0500 On 4/29/19 12:05 PM, J.B. Wood wrote: > Does anyone know if this terminal block provided an internal lightning > arrestor of some sort? You're thinking of one of these: <https://i.ebayimg.com/images/g/sssAAOSwkB5b9gwV/s-l1600.jpg> And yes, the arresters are under the two hex caps. A pair of carbon rectangles that would fail short and protect the inside wiring. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
| John Robertson <spam@flippers.com>: Apr 29 10:38AM -0700 On 2019/04/29 10:18 a.m., Fox's Mercantile wrote: > And yes, the arresters are under the two hex caps. > A pair of carbon rectangles that would fail short and protect > the inside wiring. Or this (second picture down): https://the-electric-orphanage.com/wp-protection-equipment-for-open-wire/ I saw something like that in my grandmother's house back in the 60s... John ;-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| "J.B. Wood" <arl_123234@hotmail.com>: Apr 29 01:48PM -0400 On 4/29/19 1:18 PM, Fox's Mercantile wrote: > And yes, the arresters are under the two hex caps. > A pair of carbon rectangles that would fail short and protect > the inside wiring. ello, and thanks for the quick reply. Yep, that's precisely what I remember. Sincerely, -- J. B. Wood e-mail: arl_123234@hotmail.com |
| Fox's Mercantile <jdangus@att.net>: Apr 29 12:58PM -0500 On 4/29/19 12:38 PM, John Robertson wrote: > Or this (second picture down): > https://the-electric-orphanage.com/wp-protection-equipment-for-open-wire/ > I saw something like that in my grandmother's house back in the 60s... *laughs* I have one of those at the shop, it was the original protector. My shop was built in 1919. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
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