72LB Lowboy Ch= 7H3

Crosley Radio Corp.; Cincinnati (OH)

Data
Forum
Pictures
Collections

  • Year
  • 1934
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 36980

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 7
  • Main principle
  • Superhet with RF-stage; ZF/IF 456 kHz
  • Wave bands
  • Broadcast and Short Wave (SW).
  • Power type and voltage
  • Alternating Current supply (AC) / 110 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 72LB Lowboy Ch= 7H3 - Crosley Radio Corp.;
  • Shape
  • Console, Lowboy (legs < 50 %).
  • Notes
  • A.V.C. controlled 1. AF-amplifier - see schematics
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 5 = ca. 1934 and before

 Collections | Museums | Literature

Collections

The model 72LB Lowboy is part of the collections of the following members.

 Forum

Forum contributions about this model: Crosley Radio Corp.;: 72LB Lowboy Ch= 7H3

Threads: 2 | Posts: 8

After collecting dust for three years I sent this chassis off for repair to find out that the transformer was shorted out, the speaker was shorted out and other major problems.  Turns out the repairman had another 7H3 chassis in a bad tombstone cabinet.  We worked a deal and he repaired that chassis for my loboy cabinet.  She's up and running now!

A big thank you to Mario and all the rest of you who helped me.  I've uploaded some pictures of the finished project.  It plays beautifully with excellent reception on the broadcast band, but few stations in my area for good a.m. selection.

Dave

Dave Turner, 05.Jul.12

Weitere Posts (2) zu diesem Thema.

I've been "studying" this old chassis for a while.
I put it on my dim bulb tester with a 60w bulb and the bulb does not dim, and none of the tubes light up.  However, two tubes, (69 and 70 on the schematic) a 6D6 and a 6B7, have broken cap connections.  I've ordered two new tubes to replace but don't have them yet.
Meanwhile, since this is a 75W or 100W power requirement, I exchanged the bulb for a 250W, (didn't have a 75 or 100), turned it on and the 250 bulb is very dim and the chassis started to smell and I could hear it "cooking". Transformer was getting warm.
 
Did I burn it up?
 
I'd really like to get this old radio running, but fear a new transformer will be pretty costly, and have no idea where to search for one.  The whole radio is probably worth a hundred bucks.
 
Hope you can give me some ideas.
Dave

Dave Turner, 02.Apr.09

Weitere Posts (6) zu diesem Thema.