History of the manufacturer
High Frequency Laboratories (HFL); Chicago, IL
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Both will display your name after an officer has activated your content, and will be displayed under «Further details ...» plus the text also in the forum.
| Name: | High Frequency Laboratories (HFL); Chicago, IL (USA) |
| Brand: |
 |
| Abbreviation: | high-frequ |
| Products: | Model types |
| Summary: |
High Frequency Laboratories Trade names: Isotone, Mastertone, Regent, HFL |
| History: |
Some models:
| Country | Year | Name | 1st Tube | Notes |
|---|---|---|---|---|
| USA | 31 | Mastertone 1931 | 27 | |
| USA | 32 | 222 | 35 | |
| USA | 31 | Little Giant 400 | 235 | Similar model is the RPC Little Giant HFL-4. |
| USA | 35 | 4Tube Pentode | ||
| USA | 31 | 5 | 35 | |
| USA | 31 | 505 | 24 | |
| USA | 31 | 520 | 24 | |
| USA | 31 | Mastertone 5-269 | ||
| USA | 31 | Mastertone 7 | 24 | |
| USA | 31 | Mastertone 7-292 | ||
| USA | 31 | 840 | 24 | |
| USA | 31 | 841 | 24 |
[rmxhdet-en]
Further details for this manufacturer by the members (rmfiorg):
Radio Broadcast, Oct. 1927, p. 415
| Data Compliance | More Information |