Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 6 / 6
Duane Benson
User Rank
Blogger
Tube radios
Duane Benson   5/23/2014 7:41:24 PM
NO RATINGS
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.

perl_geek
User Rank
CEO
Anachronism
perl_geek   5/23/2014 7:12:32 PM
NO RATINGS
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 

 

 

 

zeeglen
User Rank
Blogger
Don't Fire it up yet
zeeglen   5/23/2014 5:23:30 PM
NO RATINGS
@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
Rookie
what is that?
Colin Walls   5/23/2014 4:50:41 PM
NO RATINGS
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


Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
<b><a href=Betajet">

The Circle – The Future's Imperfect in the Present Tense
Betajet
5 comments
The Circle, a satirical, dystopian novel published in 2013 by San Francisco-based writer Dave Eggers, is about a large, very powerful technology company that combines aspects of Google, ...

Max Maxfield

Recommended Reads From the Engineer's Bookshelf
Max Maxfield
34 comments
I'm not sure if I read more than most folks or not, but I do I know that I spend quite a lot of time reading. I hate to be idle, so I always have a book or two somewhere about my person -- ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
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 ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...