Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Atwater Kent model 20 Big Box
#17

FWIK the A-K grid leak uses a holder with a smaller clip O.D. more like fuse clips. The A-K leak has a shoulder on the inside edges of the metal electrode ends that co-inside with the spacing of the electrode clips. The A-K leak is a smoked glass rod within a hollow glass rod "soldered" into the ends of the electrodes. I have not been able to determine how the solder grabbed the glass, but it does... The A-K leak can be "re-built" the ends are de-soldered and retained. a length of borosilicate glass tubing is prepared by torching the cut ends to smooth the glass. The electrodes are cleaned of solder and a twist drill is used to ream the ends to remove all the solder and a small amount of the brass, enough to allow the new tubing to fit, re-cut the glass tube to make the exact length as the original leak. A 1/10 watt 2.2meg axial resistor will slip inside the new tubing. Drill a hole at each end of the electrode to accept the resistor leads. Solder one end of the resistor to center it in the combination of electrodes and glass, the complete by soldering the opposite end. A touch of super-glue will firm up the electrodes to the glass. The resistor can be blackened with a sharpy to disguise that it is modern. A lot of work for appearance sake.

I wanted to see a pix of the three tube island not only to see the transformer location but if the OEM A-K grid leak clips are still in place or have been broken or removed so the Aerovox leak could be installed.

BTW that value of 6 megs leak is still O.K. the detector will not be cut off just more sensitive.

Post the diameter and the height of the A-K transformer existing and take resistance measurements of the two windings, post as well. Use an analog meter if you have one. I will look and see if I have a suitable transformer.

If I have a transformer we can use the PM (private message system) to exchange email and addresses. chas

Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”


Messages In This Thread
Atwater Kent model 20 Big Box - by TTech - 04-18-2021, 05:49 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-18-2021, 05:53 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-18-2021, 06:56 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-18-2021, 09:56 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-19-2021, 12:51 AM
RE: Atwater Kent model 20 Big Box - by TTech - 04-19-2021, 10:14 AM
RE: Atwater Kent model 20 Big Box - by Chas - 04-19-2021, 11:46 AM
RE: Atwater Kent model 20 Big Box - by Eliot Ness - 04-19-2021, 01:31 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-19-2021, 05:59 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-19-2021, 07:47 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-19-2021, 08:52 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-20-2021, 09:47 AM
RE: Atwater Kent model 20 Big Box - by Chas - 04-20-2021, 11:28 AM
RE: Atwater Kent model 20 Big Box - by TTech - 04-20-2021, 12:15 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-20-2021, 02:29 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-21-2021, 08:19 AM
RE: Atwater Kent model 20 Big Box - by Chas - 04-21-2021, 10:54 AM
RE: Atwater Kent model 20 Big Box - by TTech - 04-21-2021, 01:01 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-21-2021, 11:13 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-22-2021, 04:45 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-22-2021, 05:30 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-23-2021, 08:18 AM
RE: Atwater Kent model 20 Big Box - by TTech - 04-23-2021, 05:28 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-24-2021, 09:39 AM
RE: Atwater Kent model 20 Big Box - by TTech - 04-24-2021, 11:03 AM
RE: Atwater Kent model 20 Big Box - by TTech - 04-25-2021, 10:52 AM
RE: Atwater Kent model 20 Big Box - by Chas - 04-25-2021, 11:20 AM
RE: Atwater Kent model 20 Big Box - by TTech - 04-25-2021, 12:51 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-25-2021, 04:59 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-26-2021, 05:18 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-29-2021, 01:38 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-29-2021, 05:23 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-29-2021, 06:01 PM
RE: Atwater Kent model 20 Big Box - by Chas - 04-29-2021, 06:10 PM
RE: Atwater Kent model 20 Big Box - by TTech - 04-29-2021, 06:41 PM
RE: Atwater Kent model 20 Big Box - by Phlogiston - 05-01-2021, 04:15 PM
RE: Atwater Kent model 20 Big Box - by TTech - 05-01-2021, 08:18 PM
RE: Atwater Kent model 20 Big Box - by TTech - 05-02-2021, 02:02 PM
RE: Atwater Kent model 20 Big Box - by Phlogiston - 05-02-2021, 05:17 PM
RE: Atwater Kent model 20 Big Box - by TTech - 05-03-2021, 02:35 PM
RE: Atwater Kent model 20 Big Box - by TTech - 05-04-2021, 03:47 PM
RE: Atwater Kent model 20 Big Box - by TTech - 05-04-2021, 06:26 PM
RE: Atwater Kent model 20 Big Box - by Chas - 05-06-2021, 12:05 PM
RE: Atwater Kent model 20 Big Box - by TTech - 05-07-2021, 09:34 AM
RE: Atwater Kent model 20 Big Box - by TTech - 05-07-2021, 09:58 AM
RE: Atwater Kent model 20 Big Box - by Chas - 05-07-2021, 10:50 AM
RE: Atwater Kent model 20 Big Box - by TTech - 05-07-2021, 12:46 PM
RE: Atwater Kent model 20 Big Box - by Chas - 05-07-2021, 01:01 PM
RE: Atwater Kent model 20 Big Box - by TTech - 05-12-2021, 09:59 AM
RE: Atwater Kent model 20 Big Box - by admin - 05-12-2021, 10:26 AM
RE: Atwater Kent model 20 Big Box - by Phlogiston - 05-12-2021, 06:18 PM
RE: Atwater Kent model 20 Big Box - by TTech - 05-12-2021, 09:49 PM
RE: Atwater Kent model 20 Big Box - by Chas - 05-14-2021, 12:13 PM
RE: Atwater Kent model 20 Big Box - by OZ4 - 05-17-2021, 12:57 PM



Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
Zenith H725
I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM
Zenith H725
The PSU filter cap arrived today (thank you USPS!) so I will work on that later. Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM
Philco 610B oscillator wiring
Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM
The list of my radio & TV collection!
Magical chords of forgotten melodies, old nostalgic music on an old radio... Saturday night blues on the Mid-Waves on an...RadioSvit — 12:20 PM
Philco 42-345 Restoration/Repair
Thank you MrFixr55 the issue with this radio is that the internal coil antenna is missing and there was a wire in its pl...osanders0311 — 11:34 AM
Philco 610B oscillator wiring
Regarding the oscillator circuit which is comprised of the 6A7's cathode, control grid, and screen grid. These elements ...Radioroslyn — 10:33 AM
Philco 42-345 Restoration/Repair
Hi OSanders, First off, welcome to the Philco Phorum where Phine Phamily-Phriendly Pholks Phull of Philco Phacts and P...MrFixr55 — 08:41 AM
Philco 42-345 Restoration/Repair
Today I've been reading through the site trying to learn more about this radio. I also soldered the lose power cord cabl...osanders0311 — 08:24 PM
Philco 610B oscillator wiring
Thanks David! I do have that same later prodution model 610 schematic. I've also studied the Philco service bulletins fo...Tubester — 08:12 PM
Philco 610B oscillator wiring
Some info from Beitmans says late production. David   David — 06:06 PM

[-]
Who's Online
There are currently 2479 online users. [Complete List]
» 2 Member(s) | 2477 Guest(s)
AvatarAvatar

>