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

Interstage and output xfmrs for 38-690
#5

Well, reconsider: there is that capacitor, and it is 1uF in the sch, so say at 10kHz the series impedance of it with 8 ohm active is about 18.5 ohm so it reflects as 3,126 ohms which is closer to that 4K the 6F6 triode likes to see. So maybe the Interstage is ok.

Also, the ratio of the DC resistances is also different, in the original the primary to driver windings is 475/260 (in reality the two halves are 273 and 290 ohms) which is 1.8, and the new is 179/69 which is 2.6. But knowing not what gauges are there this, again, means nothing.

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.


Messages In This Thread
Interstage and output xfmrs for 38-690 - by morzh - 09-04-2017, 09:21 AM
RE: Interstage and output xfmrs for 38-690 - by morzh - 09-04-2017, 07:42 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
VTVM meter moves when my hand is next to it & not on
Haha! I hope so. It seemed rather lost and forgotten languishing in the frozen Northeast of England.EdHolland — 02:36 PM
VTVM meter moves when my hand is next to it & not on
Ed - it's in the Cayman's enjoying the good life.RodB — 02:14 PM
VTVM meter moves when my hand is next to it & not on
Static electricity - but the other chaps beat me to it again. I've seen this before with analogue meters. I've also ...EdHolland — 01:56 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Hi Paulo, Welcome to the Philco Phorum. I can see why you want to find good reproduction parts. That is a bea...MrFixr55 — 11:10 PM
HiFi (Chifi) tube amp build - but my own design.
Tim, I have some bakelite sockets in my work shop that I can dig up. I believe quite a few are NOS. I will take photo...RodB — 10:03 PM
Philco 610B oscillator wiring
> The cathode as noted is wired directly to the ground side of the heater filament for that tube, not to the #17 and ...Radioroslyn — 08:12 PM
HiFi (Chifi) tube amp build - but my own design.
Tim; I noticed your post a little late, but I would take one of the junk sockets and try to break a chunk out of it wi...Arran — 08:07 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
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

[-]
Who's Online
There are currently 1562 online users. [Complete List]
» 3 Member(s) | 1559 Guest(s)
AvatarAvatarAvatar

>