ANTIQUE-RADIO-LAB
Welcome, please log-in to participate in this (your) forum, by logging in you agree to abide by the rules of this forum. Until you make your FIRST post you cannot PM a Member.
ANTIQUE-RADIO-LAB

Antique Radio Forum for Collectors antique-radio-lab.forumotion.com
 
HomeHome  RegisterRegister  Log inLog in  FAQFAQ  PublicationsPublications  SearchSearch  
Can't Log In?: 1st. thing is to clean out your cookies. if that doesn't work , click on Contact field.
Any other usage, ( other than registration or Login Help) will be ignored. For other questions go to our FAQs link above.

Share | 
 

 Battery supplies for old portables & Farm Radios

Go down 
AuthorMessage
Cliff Jones
Site Administrator
Site Administrator
avatar

Join date : 2010-11-22

PostSubject: Battery supplies for old portables & Farm Radios   December 8th 2010, 5:57 pm

Heres a very good tutorial on power supplies for farm and portable tube radios.
[You must be registered and logged in to see this link.]

Heres one on Power supplies and problems that were solved.
[You must be registered and logged in to see this link.]

_________________
I'm a Science Thinker, Radio Tinkerer, and all around good guy. Just ask Me!
Back to top Go down
Jerry H
New Member


Join date : 2015-05-29

PostSubject: Re: Battery supplies for old portables & Farm Radios   May 31st 2015, 10:10 pm

Nice link Cliff, here is another way for making 90V/1.5V batteries running off A/C.  I have made three for friends and myself.  I hate changing batteries.  Let's see if I can post a picture for my first post on the forum.

[You must be registered and logged in to see this image.]
Back to top Go down
Cliff Jones
Site Administrator
Site Administrator
avatar

Join date : 2010-11-22

PostSubject: Re: Battery supplies for old portables & Farm Radios   June 1st 2015, 12:03 pm

Good Job!

_________________
I'm a Science Thinker, Radio Tinkerer, and all around good guy. Just ask Me!
Back to top Go down
FrankB
Moderator
Moderator
avatar

Join date : 2010-11-22

PostSubject: Re: Battery supplies for old portables & Farm Radios   June 9th 2015, 10:26 pm

Cliff,
 Great link.

 However, I think the power supply they show should be fused and some sort of regulation is needed, due to line voltage variations.
Also be aware that the filaments should ALWAYS be turned on and warmed up first, before any B+ is supplied.
 Failure to do so results in DC filament tubes a condition known as a "Frozen Cathode".
 This happens when the B+ is applied before the filament is warmed up, and the electrons are stripped off the filament/ cathode.
 This is why high power transmitting tubes are always "warmed up" before applying the B+.
 I had read about this decades back, and had it happen to me one time on an old battery radio.
  Adding a time delay relay to the B+ supply is pretty simple and cheap, and can save the tubes, (like your 1L6) from being ruined.
Back to top Go down
Sponsored content




PostSubject: Re: Battery supplies for old portables & Farm Radios   

Back to top Go down
 
Battery supplies for old portables & Farm Radios
Back to top 
Page 1 of 1
 Similar topics
-
» PURCHASE OF OTHER SUPPLIES FOR DANAO ADVENTURRE PARK DAILY OPERATION
» Pricelist for common used supplies ad equipment
» Preparation of PPMP for office supplies
» Jewellery making supplies, gemstone beads
» Purchase of Office supplies for LGU-Danao 2012-128

Permissions in this forum:You cannot reply to topics in this forum
ANTIQUE-RADIO-LAB :: Radio Repair Bench-
Jump to: