K-TRONIX ELECTRONICS REPAIR
Vintage Audio · Restoration · Service · www.ktronixrepair.com
Repair Report
Initial Inspection Findings
Amplifier remained in protection with the relay not engaging. Output stage and driver pairs tested healthy. Aging electrolytic capacitors and weak small-signal glass diodes in the bias and protection circuits were identified as the cause of the protect fault.
Repair Actions Completed
Replaced small electrolytic capacitors in the signal, driver, and protection sections with audio-grade parts. Replaced glass signal diodes in the bias and protection network. Performed cleaning, solder reflow, and thermal compound refresh where needed. Set bias and DC offset to specification and verified protection timing. Completed extended burn-in and stability checks.
Repair Pricing (K-Tronix Standard Rates)
| Description | Price |
|---|---|
| Full recap – signal, driver, and protection boards | $85.00 |
| Bias network adjustment and calibration | $45.00 |
| Replace glass signal diodes | $10.00 |
| Cleaning, reflow, and thermal compound service | $20.00 |
| Labor – final verification, calibration, and testing | $95.00 |
| Subtotal | $255.00 |
| Bench / Diagnostic Credit | - $89.00 |
| Total Due | $166.00 |
Notes and Recommendations
Output stage passed all checks. Bias and DC offset remain stable at operating temperature. Protection now clears normally. Consider main power filter capacitor replacement in the future as preventative maintenance.
K-Tronix Electronics Repair · Billings, Montana
www.ktronixrepair.com