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 Post subject: Radiola III Original Unrestored
PostPosted: Jan Mon 11, 2021 10:05 pm 
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Joined: May Sat 30, 2015 11:49 pm
Posts: 2050
Location: Keystone Heights, FL, USA 32656
Here is a nice Radiola III I just got. I thought I would share some photos and a video.
Listen here: https://youtu.be/uDUIOkXHzBM

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File comment: Different, smaller label than the others I have.
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File comment: Transformer measures 950Ω/16kΩ.
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File comment: Has 4 condensers instead of 5. Added 5MΩ resistor to bring grid leak down to 3.4MΩ.
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File comment: Original, fine thread whipping on battery cable.
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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Mon 11, 2021 11:15 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1196
Location: Bristol TN 37620
Nice one, Jeff


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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Tue 12, 2021 2:21 am 
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Pretty clean audio for a two tube regen rec. I use a horn more often than a cone with that sort of radio, but the audio I get is passable for speech but horrid for music. With alot of distortion.

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Tue 12, 2021 4:49 am 
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Location: Plymouth, MI
Nice pick-up Jeff, I've got a few of those lying around. Now you gotta find a Balanced Amplifier for it. :wink:

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Tue 12, 2021 6:31 pm 
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Joined: May Sat 30, 2015 11:49 pm
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Location: Keystone Heights, FL, USA 32656
It actually sounds better than the video; I had a dehumidifier running that the phone picked up. Speaker is a Peerless. Tubes are WD-11s, 22 volts and 90 volts; 4.5 C-.

I have 3 other WD-11s, all measure about 2.4Ω on filaments but only this pair sounds good. The others crackle and buzz and sometimes pass through a weak audio.

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Tue 12, 2021 6:44 pm 
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Joined: Mar Wed 16, 2011 10:44 pm
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Location: Peekskill, NY
The one WD-11 (clear, no silver getter) has the older 'sutherlin lime' getter on the press. You might want to set that one aside and use a different one.


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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Tue 12, 2021 9:26 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1196
Location: Bristol TN 37620
Maybe try 45 or 67 on the B+ amp. 90
seems too high on a 1 stage amp.


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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Tue 12, 2021 9:58 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 17039
Location: S. Dartmouth MA 02748-1225 USA
Radiola III always a fun little radio... I got my first one from an estate in '63. Not having any "serious" experience in 20's battery sets I got into it by first repairing the pigtails on the rotors. The transformer was good... as were the WD-11's. I had to find a usable rubber strip for the tube sockets, skived bicycle inner tube :) Then fired it up. The model I have has the "loop" tuner knob that was badly rusted, a friend supplied me with some nickle plating solution and anodes, I plated the knob... I also got a Barkelew antenna switch to remedy the aggravation of swapping the antenna lead to change the tuning range...

Ya, much later I found a III amp. Still have not checked it out after 40 years :roll:...

Great fun Jeff!... chas

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Wed 13, 2021 7:28 pm 
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Location: Bossier City, Louisiana
Fantastic!

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Wed 13, 2021 7:40 pm 
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Joined: May Sat 30, 2015 11:49 pm
Posts: 2050
Location: Keystone Heights, FL, USA 32656
Following hornet's suggestion I dropped the B volts to 45 with no C bias and it still sounds fine. Here are two short videos:
https://youtu.be/zSznEPSR6P8
https://youtu.be/pTUykCgx_2w

Also, following Jim's advice, those valuable tubes will be rarely used.

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 2:57 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1196
Location: Bristol TN 37620
Sounds good Jeff. Why stress the original
tubes? If you're going to use it a lot, pick
Up some subs (866, 5696)


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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 3:19 pm 
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brnhornet52 wrote:
Sounds good Jeff. Why stress the original
tubes? If you're going to use it a lot, pick Up some subs (866, 5696)
Um, 864? Good, still a bit pricey, but with a plug in adapter that is it, same volt and amp as a '11... The 5696 Miniature xenon tetrode thyratron, so says RM oops, oops? chas

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 4:23 pm 
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Joined: Mar Wed 16, 2011 10:44 pm
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Location: Peekskill, NY
The tube with the lime getter in particular is a piece of history. I've got one but it's a dud.


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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 5:26 pm 
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Joined: Aug Tue 28, 2018 9:22 pm
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Location: Sanford Fla 32771 (USA)
Here is my unrestored Radiola III, but with home made WD-11 substitutes
using 5676 and test tubes that look like the WD-11 glass envelope .


Attachments:
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IMG_2012A.png
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Last edited by pauls.ironhorse on Jan Thu 14, 2021 5:41 pm, edited 1 time in total.
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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 5:32 pm 
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Location: S. Dartmouth MA 02748-1225 USA
jim rozen wrote:
The tube with the lime getter in particular is a piece of history. I've got one but it's a dud.
Lime getter appeared on a tipless small tubular Bakelite base as well as a large tubular tipped in a brassbase with decal.

pauls.ironhorse wrote:
Here is my unrestored Radiola III, but with home made WD-11 substitutes using and test tubes that look like the WD-11.
Paul what was the type number of the miniature tube you used and what was the value of the filament shunt resistor? chas

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 5:35 pm 
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Location: Sanford Fla 32771 (USA)
Chas... Here are my original notes:
Using 5676 tube to substitute for WD-11
The following filament specs were used in calculation fil shunt resistor for 5676 tube.
5676 Fil = 120ma @ 1.25V approx = 10.4 ohms
WD11 Fil = 250 ma @ 1.1V approx = 4.4 ohms
1/Rt= 1/r1+1/r2
1/4.4=1/10.4 + 1/X
To make 5676 fil load approx to WD11, shunt 5676 fil with 8 ohms.

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 6:19 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1196
Location: Bristol TN 37620
Chas,

Big Oops on me! 864 tube is correct.
as 5676. Not enough coffee! Another
sub (little known) is a 1L4.

I once bought a Aeriola senior from
Dick Parks ( member here) who rebased
the 1L4 in a WD11 base. Worked fine.


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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 6:45 pm 
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Joined: May Sat 30, 2015 11:49 pm
Posts: 2050
Location: Keystone Heights, FL, USA 32656
Here is some tube detail. I have decided to leave them in the radio for display rather than hide them away in boxes.

Paul, how do the 5676 tubes perform in the radio?
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Attachment:
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DSC04370.JPG [ 509.65 KiB | Viewed 1176 times ]

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 7:05 pm 
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Location: Sanford Fla 32771 (USA)
jrehkopf wrote:
Paul, how do the 5676 tubes perform in the radio?

As so many of my projects once the physical part is done I tend to set it aside
for future testing. :( So I have no info on how well it worked for me.
Here is a site with some substitutes, much really good info and some testing on other tube substitutes for the WD-11.
https://www.6v6.co.uk/vcomp/tech_tips/wd11.htm

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 Post subject: Re: Radiola III Original Unrestored
PostPosted: Jan Thu 14, 2021 7:32 pm 
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Location: S. Dartmouth MA 02748-1225 USA
Thanks so much Paul for your work and the note of the UK site...

The site gives the gain of the substitutes. That is one issue with using subs the higher gain can cause problems.

I set up 864's in a Radiola III, 44 years ago for a local fellow, now SK. They worked great, regeneration was smooth audio clean from batteries. Back then I got the 864's from Alan Douglas for $2.00 each.

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