Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Dec Tue 12, 2017 12:11 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 9 posts ] 
Author Message
 Post subject: WD11 to 1LA4 adapters
PostPosted: Jan Sat 07, 2017 4:01 pm 
Member

Joined: Jul Sun 09, 2006 3:11 am
Posts: 5099
Location: Aurora, CO
I just received three WD11 to 1LA4 adapters for my Aeriola Sr. receiver and amplifier. They look well-made and have the 6.8 ohm resistor across the filament leads. I went with 1LA4 because I had 4 NOS tubes on hand and tests I read said they worked well. Hopefully this weekend I can try them. My only concern is that they could have been about an inch longer to make it easier to remove them.


Attachments:
GEDC4058.JPG
GEDC4058.JPG [ 152.77 KiB | Viewed 753 times ]

_________________
ex nihilo nihil fit
Top
 Profile  
 
 Post subject: Re: WD11 to 1LA4 adapters
PostPosted: Jan Sat 07, 2017 9:21 pm 
Member
User avatar

Joined: Sep Sat 27, 2014 4:24 am
Posts: 1370
Location: Oxford, MI
They look very nice, I wonder why the designer didn't go with a 1LH4 instead as it is a true triode (At least in one section) and one wouldn't have to deal with the issues associated with various grids that aren't being used.

_________________
Caretaker of Portable Tube Radios


Top
 Profile  
 
 Post subject: Re: WD11 to 1LA4 adapters
PostPosted: Jan Sat 07, 2017 9:28 pm 
Moderator

Joined: Jan Thu 01, 1970 1:00 am
Posts: 36060
Location: Livermore, CA
Sure do look nice. I've used 3D6's. They are low cost (at least they were) and don't need an added filament resistor.

James Fred (deceased) made me special adapters where the entire metal portion of 3D6 went inside. Only glass portion of the loctal tube showed.

_________________
Norm


Top
 Profile  
 
 Post subject: Re: WD11 to 1LA4 adapters
PostPosted: Jan Sun 08, 2017 12:26 am 
Member
User avatar

Joined: Aug Mon 20, 2012 12:23 pm
Posts: 1167
Location: Groveland MA
Where did you get them?

Russ

_________________
A place for everything, everything in it's place. I just don't remember where all those places are.


Top
 Profile  
 
 Post subject: Re: WD11 to 1LA4 adapters
PostPosted: Jan Sun 08, 2017 3:41 am 
Moderator

Joined: Jul Tue 18, 2006 5:23 am
Posts: 10930
Location: Roseville,Ca
Norm Leal wrote:
Sure do look nice. I've used 3D6's. They are low cost (at least they were) and don't need an added filament resistor.

James Fred (deceased) made me special adapters where the entire metal portion of 3D6 went inside. Only glass portion of the loctal tube showed.


Like this Norm??

Image

Currently has a 1LE3 in it.
Phil

_________________
I've been doing so much for so long with so little I can now do anything with nothing!


Top
 Profile  
 
 Post subject: Re: WD11 to 1LA4 adapters
PostPosted: Jan Sun 08, 2017 3:57 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3037
Location: Massachusetts
radioalfa wrote:
Where did you get them?

Russ


Looks like the ones on ebay I have seen


Top
 Profile  
 
 Post subject: Re: WD11 to 1LA4 adapters
PostPosted: Jan Sun 08, 2017 4:08 am 
Member

Joined: Jul Sun 09, 2006 3:11 am
Posts: 5099
Location: Aurora, CO
Yep, the ones from China. I confirmed they had the filament resistors. I based my decision on this info: "After similar tests were done with 1Q5s, it was found that there was little
perceptible difference in the performance of 1A5s, 1Q5s and 1LA4s. In conclusion, I prefer the 1A5 or 1Q5 for a substitute. They are cheap and available and perform
very much like the WD11." 1A5 and 1LA4 are identical except for base.
http://www.antiquewireless.org/uploads/ ... the_wd.pdf

_________________
ex nihilo nihil fit


Top
 Profile  
 
 Post subject: Re: WD11 to 1LA4 adapters
PostPosted: Jan Tue 10, 2017 3:56 pm 
Member

Joined: Jul Sun 09, 2006 3:11 am
Posts: 5099
Location: Aurora, CO
The initial test didn't go well. I'm using the ARBE-III so the voltages are correct. I'm using a long wire antenna- about 20 feet, no ground. Frost headphones are known to work. I can hear some clicking on the headphones, but no reception. I checked the coils and they all have continuity. The 1meg resistor measured 3.3meg so I bridged in a 1meg resistor. I may change the caps, but I doubt if they have a problem. Next I'll check the wiring on the adapters.

_________________
ex nihilo nihil fit


Top
 Profile  
 
 Post subject: Re: WD11 to 1LA4 adapters
PostPosted: Jan Tue 10, 2017 4:25 pm 
Member
User avatar

Joined: Sep Sat 27, 2014 4:24 am
Posts: 1370
Location: Oxford, MI
On early radios like the Aeriola Sr. A ground if of pivotal importance for good or any reception.

_________________
Caretaker of Portable Tube Radios


Top
 Profile  
 
Post New Topic Post Reply  [ 9 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: delco32, PhilF and 9 guests



Search for:
Jump to:  


















Privacy Policy :: Powered by phpBB