Embedded Systems Conference
Breaking News
Newest First | Oldest First | Threaded View
<<   <   Page 6 / 6
Duane Benson
User Rank
Tube radios
Duane Benson   5/23/2014 7:41:24 PM
I still have two tube radios. I've got a Hallicrafters S-38, 1940's (I think) vintage short wave radio. I haven't turned it on in a few years, but it worked just fine the last time I did.

I've also got a 1929 Atwater Kent TRF (tuned radio frequency) radio. Unfortunately, I don't have the cabinet. Just the radio. I haven't turned it on since about 1984, but it did work then. The sound wasn't so great after my rather lousy job of re-coning the speaker. I'm a little afraid to turn it on now, because of the old capacitors.

User Rank
perl_geek   5/23/2014 7:12:32 PM
I think you'll find that the radio dates from the mid 1950s, not the early 1940s.

Apart from the aesthetics, the firm's history http://www.grundig.de/en/company/about-grundig/grundig-history/years-1945-1954/ indicates it was strictly a post-war manufacturer.

If you're going to fix it, you might want to RTFM; http://www.grundig.owner-manuals.com/5088-service-manual-GRUNDIG.html  (I assume the site is kosher, but caveat emptor).

Other people have also repaired them, and the comments suggest it's worth doing: http://www.radiomuseum.org/r/grundig_konzertgeraet_5088_1.html 




User Rank
Don't Fire it up yet
zeeglen   5/23/2014 5:23:30 PM
@Max:  You would be wise to replace all the paper and electrolytic capacitors BEFORE applying power.  You don't want to fry a hard-to-obtain vacuum tube.  And there is a lot more that goes wrong with tubes than just their heaters/filaments. 

That Grundig radio probably has a power transformer so the heaters will be in parallel, unlike the series connected heaters in the "All American 5".

There is a Yahoo group called "Fun with tubes" that have a lot of good information on restoring antique radios and designing guitar amplifiers.

When I was a little kid my parents had a Grundig radio that looked very similar.

Colin Walls
User Rank
what is that?
Colin Walls   5/23/2014 4:50:41 PM
Hi Max

First off, diagnosing vacuum tube [sorry "valve"!] falures is not too hard. It is the filament that gives out. If it doesn't glow and get hot, it's dead.  Unfortunately, some designed wire all the filaments in series, so, when one dies, they all appear dead. So you ned to pull each  one and check its filament.  A bit like Christmas tree lights ..

Is that an ASR33 Teletype outside your office? If so, why??


BR c

<<   <   Page 6 / 6

Autonomous vehicles on our roads soon? What could go wrong with that? Listen in as EE Times' Junko Yoshida asks industry experts what the intended and unintended consequences will be.
Flash Poll
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
The LTC®4015 is a complete synchronous buck controller/ ...
The LTC®2983 measures a wide variety of temperature sensors ...
The LT®3042 is a high performance low dropout linear ...
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...