HTX-100 Parts-Radio Shack HTX-100

Radio Shack HTX-100

HTX-100 Replacement Parts

X001: 10.6975MHz Crystal (49U)
Exact identical replacement for X1 (X001 QX-122 10.6975 BQXY0122002) which is one of the most common failures in these rigs.

This crystal is electrically and physically identical, and solders in easily.  Custom-manufactured to my specifications specifically for HTX-100 radios!

Specifications:
  Frequency: 10.697500 MHz
  Load Capacitance: 20 pF
  Frequency Tolerance (25 Deg C): +/- 30 PPM
  Operating Temp Range: -20 Dec C to +70 Dec C
  Driver Level: 100uW
  ESR: 30 Ohms Max
  Marking: WTL r1 10.6975
  Case Package: 49U
 
EXAMPLE of Corroded Crystal, which this replaces:
Caption
s-l1600order_now_btn
 
X001: 10.6975MHz Crystal (49S)
Nearly identical (but shorter) replacement for X1 (X001 QX-122 10.6975 BQXY0122002) which is one of the most common failures in these rigs.

This crystal is electrically identical and solders in easily.  However, it is shorter (3.5mm max vs. 13mm), which may add to long-term reliability.  Custom-manufactured to my specifications specifically for HTX-100 radios!

Specifications:
  Frequency: 10.697500 MHz
  Load Capacitance: 20 pF
  Frequency Tolerance (20 Deg C): +/- 30 PPM
  Resistance (RR): 60 Ohms
  Holder Type: XSA-49S
  Marking: CREC10.6975
  Case Package: 49S/49US
s-l1600order_now_btn

 
C413: 0.047F (47,000uF) 5.5V Super Capacitor
Exact identical replacement for C143 (CZ-127 BCZY0127001) which provides memory-backup for the CPU.

This capacitor is electrically and physically identical, and solders in easily. 

Specifications:
  Capcitance: 0.047F (47,000uF)
  Voltage (max): 5.5V
  ESR: 40Ω
  Diameter: 13mm
  Height: 8.5mm
  Lead Spacing: 5.08mm
  Temp Range: -25 degC to +70 degC
  Tolerance: -20% / +80%
  Series: FS
s-l1600order_now_btn

 
C413: 0.47F (470,000uF) 5.5V Super Capacitor
Extended capacity replacement for C143 (CZ-127 BCZY0127001) which provides memory-backup for the CPU.

This capacitor has 10x the capcitance of the original and is physically a tight bit, but still fits perfectly into the PCB solder mask and solders in easily. 

Specifications:
  Capcitance: 0.47F (470,000uF)
  Voltage (max): 5.5V
  ESR: 65Ω
  Diameter: 16.5mm
  Height: 15mm
  Lead Spacing: 5.08mm
  Temp Range: -25 degC to +70 degC
  Tolerance: -20% / +80%
  Series: FYD
s-l1600order_now_btn

 
S613: Rotary Encoder
Very similar replacement for S613 (S613 SR-409 EC-S-06 BSRY0409001) which corrects issues with the main tuning knob skipping and/or going the wrong direction.

This encoder is electrically identical, but required the following minor phsyical adjustments:
  • Bend its shield/mounting tabs under encoder
  • Must slightly bend/open upper part of metal case thru-hole to fit encoder threads through
  • Double check alignment through front plastic with knob before tightening locking nut to metal front
  • Shaft is slightly shorter, so donít push knob on too hard
  • Nearly identical tactile feel to original, but slightly firmer, likely due to being new
  • Be careful to not bend shaft
  • Pins are 100% identical and solder through PCB or may be extended with wire
  • Rotations/tuning speed are identical (20 Detents/PPR)

Specifications:
  Output: Incremental quadrature 2-bits/channels
  Pulses per Revolution (PPR): 20
  Detents: 20
  Shaft Length: 20mm
  Shaft: 6mm dia D-shape
  Switch: None
  Bushing: 7mm dia x 5mm len (0.75 pitch)
 
s-l1600order_now_btn

 
VR504: Volume Potentiometer w/ Power Switch
Very similar replacement for VR504 (VR504 RV-68650KA BRVY0686001) which corrects issues with scratchy/carbon-build up on the volume knob.

This potentiometer is electrically identical, but required the following minor phsyical adjustments:
  • Bend its shield/mounting tab
  • Rotate 90 degrees from original
  • Use hookup wire to connect
  • Shaft is 3mm shorter than original, but knob works fine

Specifications:
  Output: 50k analog audio taper
  Orientation: Horizontal
  Power Rating: 25mW
  Element Type: Carbon
  Number of tuens: 1 turn
  Detents: None
  Type: Rotary
  Length: 20mm
  Shaft: 6mm dia D-shape
  Switch: None
  Bushing: 7mm dia x 5mm len (0.75 pitch) (M7XP0.75)
 
Caption