[Milsurplus] German Torn E.b Receiver- Suspicious Errors.

[Mike Feher]

I have played with several Torn E.B. receivers. Never found any issues with
any of them. The Germans were ultra strict in the manufacturing process.
Lots of times you can see solder joints with a glob of paint to indicate
that it was verified as OK. I have found however that a lot of US hams have
confused the meaning of HT as heater rather than high tension or vice versa.
Of course, this often led to problems. 73 - Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
<milsurplus-bounces at mailman.qth.net> On Behalf Of David Stinson
Sent: Thursday, January 25, 2024 7:12 AM
To: milsurplus at mailman <milsurplus at mailman.qth.net>; MMRCG <MMRCG at groups.io>
Subject: [Milsurplus] German Torn E.b Receiver- Suspicious Errors.

 

Every few days, I get a little time to work on this WWII German Torn E.b
receiver.  Been fixing the damage done by someone trying to re-tube it, but
there are other, more interesting things in here.

 

First- This radio could never have functioned.

These solder joints are obviously original, but the primary power wiring,
B+, B- and Filament are all hosed-up from the power connector to the power
switch and from there to the receiver circuits.

 

I replaced the missing tube socket, repaired the filament circuits, then
replaced a couple of bad resistors fried by having B+ between them and
ground.

Tested the B+/B- buss for shorts/leakage. It looked OK so bypassed the bad
wiring and connected voltage to the busses for a first test.

Filament circuit looked OK except the audio tube's filament was at 2.2V when
the RF tubes were at 1.8V That's going to be a Hi-Z ground somewhere.

Brought the B+ up slow and, touching the plate of the 2nd RF tube produced a
satisfying racket.

However, no such response from the 1st RF.  Got to measuring and I had no
plate or screen voltage there.

 

On inspection, I found something odd- both the plate and screen connections
at the tube socket were carefully placed and with "molded" solder to look
like good connections, but once the wires were moved aside, neither
connection had actually been made.

I should have take photos.

 

I wonder if it was just sloppy workmanship and rubber-stamp inspection (not
like the Germans in 1943) or if some poor forced-labor person did this
intentionally.  Guess we'll never know.

 

Not the first piece of gear I've found

"inop out of the box." RBB refurbished in San Fran with some of the band
switches put back 180 degrees off, a ZM-11 bridge with wires crossed, etc.

 

Have you seen factory/depot defects in your mil gear?

 

GL OM ES 73 DE Dave AB5S

 

 

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