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 Telaverta Model TV24
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 Return to top of page · Post #: 1 · Written at 10:29:09 PM on 23 February 2010.
Radioman48's Gravatar
 Location: Melbourne, VIC
 Member since 23 February 2010
 Member #: 629
 Postcount: 14

I'm new to vintage radio but have been thinking about this hobby for some time. Just acquired a bakelite Telaverta Model TV24 circa 1946 in good condition and I'm keen to restore the radio to working order. I wont be trying to get any sound from the radio until I check out the wiring, replace the electrolytics, etc. The rubber insulation on the power lead has totally perished but the internal wiring seems fine. Will definitely replace the power lead! I'm reasonably familiar with the valve line up: 6J8G, 6U7G, 6B6G, 6V6G and 5Y3G. The radio has a short wave switch (centre of three front controls) and a tone control at the back of the chassis. Haven't seen this set up before. After some research on the web I've discovered that the circuit diagram is most likely in AORSM Vol 5. It would be nice to have a copy - makes it easier to check resistors which have confusing colour codes compared with modern components. Would appreciate any suggestions on restoring the radio (internals) and where to get parts like dial cord, dial lamps, small screws, etc. Looks like this project will keep me busy for a while.


 
 Return to top of page · Post #: 2 · Written at 12:36:43 AM on 24 February 2010.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4519

Circuit is no hassle I can send a copy to Brad to forward.

Circuit is pretty much run of the mill. 6B6 is a horrid valve. Beware that the diagram states very clearly that they used 1000 ohm per volt meter.
DVM will give higher readings in many cases, and that may be misleading.

Dial string is available, check the gauge of the cordage they used, as sometimes, builders line works wonders. I did get a veteran that used thick cord & paracute cord went well.

Just buy 630V caps to replace the paper ones. The red greencaps often have physical limitations at replacing the axial papers. Refer to the Evatco web page for metalised polypropylene etc. axials, that have a better chance of reaching the terminals.

Marc

Edit button
Click image to view larger resolution.


 
 Return to top of page · Post #: 3 · Written at 12:39:33 AM on 24 February 2010.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4519

Did someone say they were going to add edit function so that I could fix the typo?


 
 Return to top of page · Post #: 4 · Written at 4:53:30 AM on 24 February 2010.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6585

G'day Marc,

The edit button should be at the bottom of your posts. Unlike the front page there is no time limit here in the forums.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 5 · Written at 9:36:48 AM on 24 February 2010.
Radioman48's Gravatar
 Location: Melbourne, VIC
 Member since 23 February 2010
 Member #: 629
 Postcount: 14

Thanks guys. Note your point about 1000 ohm/volt meter. Never thought of that! Even my old analogue meter is 20,000 ohm/volt. I'll give builders string-line a go for the dial cord - but it may be slightly thicker. Might try a 6SQ7-GT in place of 6B6-G (some pin re-wiring required). What do you think? Cheers, John.


 
 Return to top of page · Post #: 6 · Written at 9:05:15 PM on 24 February 2010.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4519

20,000 Ohm per volt Analogue will fall into the same category.

Would not bother with valve change if the other one is working. The ones that have been working for fifty years are the good ones; The replacement may not go that far.

I am trying to avoid buying a whole roll of cord which is not all that expensive, but the only ones that I think have it were WES

Marc


 
 Return to top of page · Post #: 7 · Written at 9:07:27 PM on 24 February 2010.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4519

Brad

No see edit anywhere?

I will have a look with IE, this is Mozilla

Marc


 
 Return to top of page · Post #: 8 · Written at 11:14:42 AM on 25 February 2010.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6585

G'day Marc,

I will check things out tonight though my admin buttons are appearing and work with no issues. Also, I was out last night so I will pass on the circuit diagram tonight and post a link to it here as well if this is okay.

Update: Here's a screenshot of what the link to edit looks like and its position. Also, circuit diagram is now posted and forwarded. Smile

Edit button
Click image to view larger resolution.


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A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 9 · Written at 10:48:16 PM on 25 February 2010.
Radioman48's Gravatar
 Location: Melbourne, VIC
 Member since 23 February 2010
 Member #: 629
 Postcount: 14

Hi Brad,

Thanks heaps for the circuit diagram. It's about as simple as you can get with five valves. Noted Marc's comments about replacement components and voltage measurements (and the notes on the circuit).

Any background on the D.W. Radio Company (Chatswood, NSW)? Looks like they operated both before and after WW2. I have relatives (by marriage) that lived in this part of Sydney at the time. Sadly most have passed on including David Hain (you might be interested in Googling this name).

I guess D.W. are the initials of the owner. I wonder who he was?

Cheers, John.


 
 Return to top of page · Post #: 10 · Written at 10:53:27 PM on 25 February 2010.
Radioman48's Gravatar
 Location: Melbourne, VIC
 Member since 23 February 2010
 Member #: 629
 Postcount: 14

Sorry, I meant to say: try Googling the terms "david hain sydney radio".

Cheers, John.


 
 Return to top of page · Post #: 11 · Written at 2:43:51 AM on 26 February 2010.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4519

OK I looked at it with Mozilla & IE8

No edit function sighted


 
 Return to top of page · Post #: 12 · Written at 6:01:15 AM on 26 February 2010.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6585

G'day Marc,

It just occurred to me that you might not be using the Remember me function at log in time so I tried that and sure enough there looks like a bug in the little script I wrote that supports the edit function.

Looks like I will be busy this weekend fixing that up. Once sorted it should work for both types of log in and in any browser. Wink

Update: The edit link should now appear for both types of log ins. Smile


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 13 · Written at 10:07:52 PM on 3 March 2010.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4519

Edit function sighted

See no reference to Televerta, Hain, or DW Radio in 1937 "Radio Trade Annual"

Marc


 
 Return to top of page · Post #: 14 · Written at 9:53:10 AM on 15 March 2010.
Radioman48's Gravatar
 Location: Melbourne, VIC
 Member since 23 February 2010
 Member #: 629
 Postcount: 14

Thanks Marc. I might try to contact historical societies in Chatswood area. They would have access to old newspapers, etc.

Cheers, John.


 
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