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: 2 Guest(s)
[-]
Recent Posts
Philco Battery-WWII vintage
Mike; I take it that Soviet cars did not come equipped with block heaters, hence the hot oil change? Where I lived in...Arran — 08:42 PM
Philco 42-345 Restoration/Repair
The more the better. (Within reasonable limits.) 2-5 times more is no problem in this case.Vlad95 — 03:50 PM
Philco 42-345 Restoration/Repair
Thanks, RodB and Vlad95, I was mainly trying to figure out this capacitor to locate a replacement, Vlad thank you for...osanders0311 — 03:44 PM
Testing a speaker and output transformer Trutone A2-G
Would an output transformer if weak, cause the problems I am seeing with lower B+ voltage? murfmurf — 01:22 PM
Testing a speaker and output transformer Trutone A2-G
Hello murf! I merged the threads. Please do not start new threads regarding the same radio. Take care, - GaryGarySP — 10:21 PM
Philco 42-345 Restoration/Repair
Regarding picture 5 on page 1 of this thread this capacitor is #40 on scematics diagram - 4mF+4mF. Black wire is "-...Vlad95 — 09:01 PM
Philco 42-345 Restoration/Repair
That's a dual 4 MFD, red and green are both 4mfd and black is common negative. You should be able to see them in the pow...RodB — 08:58 PM
Philco 42-345 Restoration/Repair
Can anyone help me figure out a capacitor that has 3 wires coming out of it red and green on one side and a black wire o...osanders0311 — 08:14 PM
Two small radios from France. Restoration and review.
Greetings; I think that it's possible that the assortment of components was the result of post war parts shortages, a...Arran — 12:18 PM
Philco model 38 code 121 not receiving signal.
Unfortunately I can't inject any audio into the volume control. It is in the primary circuit of the antenna coil, not in...Stormlord5500 — 09:32 AM

[-]
Who's Online
There are currently 610 online users. [Complete List]
» 1 Member(s) | 609 Guest(s)
Avatar

>