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

Ecap help
#31

(03-12-2015, 11:57 AM)PAradiogeek Wrote:  Kirk,

I don't know how to sort this bad boy out.  Looking at the Model 979 schematic, there are differences.  On the good side, that schematic shows 2 caps (both 20 uF), but there are tube line-up differences.  The converter is a 6K8 (instead of a 6A7), the IF is a 6K6 (instead of 6D6), the rectifier is a 25Z6 (instead of a 25Z5), and the ballast is a BM43B instead of a BM49C.

According to my tube substitution data, the 6K8 and 6A7 are not subs for one another.  The 6K6 and the 6D6 are similar though not direct substitutes.  The rectifier tubes seem to be direct replacements.
I don't believe that  the ballast tube difference is very significant (maybe someone down the line swapped a '49C for the original '43B).

In any event, if you want to go with that schematic, both caps are shown as 20 uF caps, but I honestly don't think the Model 979 is the right model to use.  Too many differences.

 A 6K8 is a mixer-oscillator/converter tube though, but a triode-hexode rather then a pentagrid type, they could use the 6K8 with some electrical changes, other then the fact the 6K8 uses an octal socket of course. A 6k6 is definitely NOT a substitute for a 6D6, a 6K6 is a power output tube, basically an octal based version of a type #41. I believe you may have been thinking of a 6K7 rather then a 6K6, either that or there was a misprint in your tube substitution manual where they meant to print 6K7 or 6K7G, a type #78 tube is a substitute for a 6D6. A 25Z6 was the octal based successor to a 25Z5, actually it's a more robust tube then a 25Z5, both were intended to be used in a voltage doubler power supply circuit though 99 out of 100 radio models that used them had the two diodes wired in parallel.
Regards
Arran
#32

Kirk,
 This is a tough one for sure! I have not looked at the schematics yet but the manual I looked at shows a whole different tube line up for the model 911 including using a 6x5 rectifier.That manual is the one that shows the 6g5 being used in the model 979 which is why I did not look at the schematic for that one. I have found no reference to a model 919 in any manual yet. Could it be that it was marketed under under name?
                                                                                 Henry
#33

No idea Henry,

It was definitely sold under Automatic or Maybe hazeltine as it says on the tag. A few of my mystery Halsons have the same issue.

Still havent made it to the house to get the wiring details.

Dont kill yourself doing this. Mike is gonna fix it. Icon_mrgreen
I'm sure it is something small because it was working for a few minutesn then later when i turned it on it didn't get any stations.
UGH

Kirk

Times I have been electrocuted in 2021
As of 1/01/2021
AC: 4 DC: 1
Last year: 6
#34

If you are in no hurry, I will fix it for ya Icon_smile but right now I have to:

1. Move
2. Do my taxes
3. Set up shop in the new place.

How fast do you need this?

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.
#35

I can wait 2 years Mike, No rush at all!

Not like you gave me any cabinets when I was moving........................................... Icon_lolno

Times I have been electrocuted in 2021
As of 1/01/2021
AC: 4 DC: 1
Last year: 6
#36

Kirk,
 I'm sure it is a quick fix for someone with a little more experience. Mike will have no problems . I am interested in finding the documentation that's all.
                Good Luck,
                     Henry
#37

I gave you the cabinets while you were still in renovation mode Icon_twisted

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.
#38

I should have buried them in the walls. Icon_mrgreen

The ?? what the hockey stix model is that.. Anyway I think it will need a loooooooooot of TLC.

I saw it today on top of a stack of furniture, wish I hadnt Icon_lol

Kirk

Times I have been electrocuted in 2021
As of 1/01/2021
AC: 4 DC: 1
Last year: 6
#39

I am seriously mulling over buying a pet rat.... Icon_smile . A piece of Jarlsberg inside that yammie looking well waxed coil will be a housewarming gift Icon_lol

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.
#40

His name will be Misha and he will only eat crappy cabinets that are broken in shipping. As you would say... Muahahahaha Icon_twisted

Kirk

Times I have been electrocuted in 2021
As of 1/01/2021
AC: 4 DC: 1
Last year: 6




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 91 Restore Code ??
I knew that Fluke was the Cadillac so with that in mind what Fluke would you recommend I get?dconant — 03:53 PM
Philco 91 Restore Code ??
Yep. 10W is probably enough. Also, if the meter measures Farads, then it should also have that "Delta" button...morzh — 02:38 PM
Philco 91 Restore Code ??
I measured the current through the resistor I am using as a replacement for the speaker field coil and got 40ma. So that...dconant — 02:32 PM
Philco 91 Restore Code ??
No I'm not saying I don't own a DMM. I have a CCC one (Thsinde 18+). I forgot that could read caps. I did purchase a Flu...dconant — 02:28 PM
Philco 91 Restore Code ??
Are you telling me you do not own any decent DMM, that can measure capacitances from a few pF and up? Even todays CCC (C...morzh — 01:44 PM
Restoring Philco 96
Well, selectivity today, with stations disappearing, is not such a problem for TRF as it likely used to be. Although wh...morzh — 01:42 PM
Philco 91 Restore Code ??
Mike I did that already and can't really get any kind of reading. My little Honeytek A6013L reads 0 on all scales. One s...dconant — 01:38 PM
New member
Well, to be frank, when it comes to radios, especially the older types, a person with no electronic background could be ...morzh — 01:33 PM
Restoring Philco 96
Thanks for mentioning the video you had uploaded. Somehow I missed that post. Just watched your video, and it sounds to ...jrblasde — 01:28 PM
Restoring Philco 96
Joseph well, for now we will have to get by the video I have made, as the final video would not be made before I get a ...morzh — 01:04 PM

[-]
Who's Online
There are currently 3101 online users. [Complete List]
» 2 Member(s) | 3099 Guest(s)
AvatarAvatar

>