The Hammarlund SP-100X Super-Pro radio is an all-wave radio center receiver, one of the varieties of the famous Hammarlund Super-Pro series.
The new “100” Super-Pro series was introduced in January 1937. The frequency range is 0.54 … 20 MHz. Types of work – TLG and AM. Quartz filter. Desktop version in a metal case. Hammarlund Film Company (USA). The SP-100 series has been in production for about three years. The total number of SP-100 Super-Pros produced was about 1200 receivers.
The case for the early Super-Pro and SP-100 is really nothing more than a dust shield that is secured with eight thumb nuts in the front and three thumb screws in the back. The back of the dust cover has a metal ID tag with printable receiver type and serial number, but in most cases it bears some kind of factory identification code – usually two letters. A 19 “rack mount model was available with the Crystal Filter option enabled. The front panel on early pre-WWII Super-Pro receivers is made of 0.190-inch aluminum. First, the black fold was processed and then the engraving was engraved. This resulted in the nomenclature looking bright silver.
The model designations used with the SP-100 series were as follows: SP-100 covered 0.54 to 20 μS and had no quartz filter, SP-100L covered 100 to 400 kHz and 2.5 to 20 μS, SP- 100S covered 1.25 to 40 μS. If a crystal filter was added to any version, the suffix “X” was added.
| Frequency range: | 0.1-0.4 / 2.5-20 MHz |
| Mode: | AM/CW |
| Voltage: | Separate PSU |
| Power consumption: | Max 80 W |
| Impedance: | 200 ohms / ? |
| Dimensions (W*H*D): | 455*261*440 mm (17.91*10.28*17.32″) |
| Weight: | 14 Kg (30.86 lbs) |
| Manufactured: | USA, 1937-19xx (Discontinued) |
| Other: | Early Lamb crystal filter without selectivity control |
