1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration

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

Linear Mode
6A7 question on 39-6
Arran
Phorum Expert
*****
Posts: 4,861
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA
#6

07-28-2018, 02:57 AM
Very pretty glow, but useless as a mixer oscillator tube, the gas disrupts the mutual conductance of the tube, making it conduct too well, almost like a short circuit. I've never seen that happen with a 6A7 tube before, I had a #224 tube that did that and had to get a refund from the fleabay seller I bought it from, but it was a balloon type so you run into that more often with early production tubes then later ones.
Regards
Arran
Find
« Next Oldest | Next Newest »
Thread Closed


Messages In This Thread
6A7 question on 39-6 - by Shaleradio - 07-21-2018, 06:06 PM
RE: 6A7 question on 39-6 - by Ron Ramirez - 07-21-2018, 06:12 PM
RE: 6A7 question on 39-6 - by Phlogiston - 07-21-2018, 07:29 PM
RE: 6A7 question on 39-6 - by Shaleradio - 07-21-2018, 07:42 PM
RE: 6A7 question on 39-6 - by codefox1 - 07-23-2018, 06:35 PM
RE: 6A7 question on 39-6 - by Arran - 07-28-2018, 02:57 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM
First Radio restoration
You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM
Zenith H725
Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately. More ...EdHolland — 10:18 AM
Graphics for majestic 1050 dial glass.
Murf; I found this thread on the ARF, the first photo has a pretty good view of the dial glass. Regards ArranArran — 01:12 AM
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM
Zenith H725
Ed; One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM
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

[-]
Who's Online
There are currently 1342 online users. [Complete List]
» 2 Member(s) | 1340 Guest(s)
AvatarAvatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration