#JLX CRYSTAL DASH MANUALS#
#JLX CRYSTAL DASH SERIAL#
#JLX CRYSTAL DASH MANUAL#
#JLX CRYSTAL DASH OFFLINE#

Wrinkle finish front panel with white engraved lettering. Replaces JX-17 red metal knobs, not very common.įrequency control (4 position). Several ckt modifications.ĭiversity receiver. Special frequency range, 200-400 khz, 540Ĭorps. frequency range, 54Okhz-54mhz Signal Corps. Equipped with 25 to 60 cycle power supply. 3376-Phila-52.Īlso designated previously as R-542/FRR. Replacesįrequency control.Note: This model made to complete NAVY order, without theĬhanges per ECN1156 as standard J series. Believed to be a cover for a CIAįrequency range, 100-400khz, 1.35-29.7 mhz. Also has separate IF gain control located where the X-talįrequency control was normally located. Note: many early SP-600's were simply designated SP-600-JX Alsoĭesignated R-274A/FRR ('Fixed Radio Receiver') Signal Corps order no.

#JLX CRYSTAL DASH SERIAL#

Les Locklear made this overview of models and serial numbers: I was able to retrieve some information using the Wayback Machine. In 2014 a few volunteers worked to salvage it but finally gave up in 2014.

#JLX CRYSTAL DASH OFFLINE#

The Hammarlund Historian web page went offline a few years back.

#JLX CRYSTAL DASH MANUALS#

The military Technical Manuals for maintenance and alignment of this radio are available free on the internet. Designed specs for the SP-600 can only be achieved with an accurate IF and RF alignment.

#JLX CRYSTAL DASH MANUAL#

SP-600 is excellent for SSB and ECR reception but the radio must be properly operated for MANUAL (not AVC) reception and you must ride the RF gain manually. Nonetheless, the Band Change and Tuning knobs had to be properly set for best performance from the XTAL controlled frequencies. The delta change knob above the BFO knob adjusts XTAL frequency setting, not the BFO which is extremely accurate when correctly aligned. The XTAL positions 1-6 are each controlled by a crystal for individual and extremely accurate (for the day) frequency control of six specified frequencies. The crystal selectivity positions were intended primarily for CW and RTTY reception but they are very useful for tuning other signals as well. Opted for a better sealed meter rather than illumination. None of the SP-600 RF/AF meters were illuminated.

Speaker audio from a stock SP-600 will not cut off if headphones are All Hammarlund SP-600s which include the letter 'J' in the nomenclature were built to military specifications, whether they had a military contract tag or not. This is one of the best tube SW receivers ever built. Two persons, including Robert Dash, Mark D Avant, listed the phone number (803) 790-6836 as their own, various documents indicated.In a Youtube comment user Willow Slough wrote: There is a chance that the phone number (803) 782-7512 is shared by Claude H Varn, Lila R Varn, C Harold Varn. Crystal has phone numbers (803) 556-0327 (Sprint Spectrum LP), (803) 234-8575 (Telcove Of South Carolina, IncSprint Spectrum LP). We assume that at least two people including Queen Chaney, Ida R Sanders may know Crystal based on this residence history. Columbia, SC and Hopkins, SC are the two cities where Crystal lived. 1101 Hallbrook Dr, Columbia, SC 29209 is where Crystal used to live back in the day. Linda Anderson, Charles Kelley, and three other persons are also associated with this address. 4851 Old Leesburg Rd, Hopkins, SC is where Crystal resides. Alternative name, for example, Crystal S Dash could be used by Crystal.

Jlx crystal dash