606
Item nr.
| Production | USA, 1947. |
|---|---|
| Bands | BC (530-1700kc). |
| Tubes | 1LN5 (RF stage), 1LA6 (converter), 1LN5 (IF stage), 1LH4 (detector, pre-amp), 3Q5GT (output). |
| Semi- conductors | Rectifier. |
| Cabinet | Wood. Size 35x24x16.5cm. |
| Power | AC/DC 110V@11W or Batt 90V&9V. |
| Documents | See Rmorg, Schema, Label. |
were often for dual use, also as a second set in the home. Because batteries were expensive, portables for dual use often could play from mains as well. In many American sets a plug-operated switch is found to select between battery and mains operation. American dials often are marked in multiples of 10kHz, so here 55 means 550kHz. 
The dial is quite stretched out on the lower end, observe how the move from 55 to 60 is about the same as from 140 to 170. Indeed, stations are more cramped on the higher end and this results from how capacity and frequency are related.
| Obtained | 6/2025 from Hans van Kampen (at NVHR meeting). |
|---|---|
| Condition | 8; looks nice, complete, works. |
| Value (est.) | 22€. |
| Sound sample | PLAY SOUND Wendy van Wanten thinks back to Athens. |
After these preliminary works, the radio was completely dead and I found out that the 1LH4 had an interrupted filament. I tried fitting in a DAF91 but this did't work well. But it got all other filaments heated up, and I found there was no oscillation because of a dead 1LA6. Also one of the 1LN5 was worn out. So I got replacements for 1LN5, 1LA6, and 1LN4, and after placing them I got some faint sounds.
Some more soldering brought the radio up to par. I replaced three remaining paper capacitors, placed an 11k resistor parallel to the heater ballast (thus increasing the filament current from 48 to 52mA; the filament voltage was just about 1.1V per filament) and replaced the oscillator grid leak resistor (which has become 61 instead of 220k).
