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An instrument from a smaller manufacturer but very well built.
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| Serial Number: | 398 |
| Year of Manufacture: | 1961 (Component date stamp 61??). |
| Date of Receipt: | 2005 Jul 31 |
| State upon Receipt: | Fairly clean. MSD NIXIE bad on 5,7,8, but readable. Timebase period incorrect on 10S gate. |
| Date: | 2005 Aug 4 |
| Procedure: | Cleaning completed, reassembled. |
| Date: | 2005 Aug 5 |
| Procedure: | 180µF capacitor for 10S timebase has corroded lead. Replaced with 220µF. Trimmer adjusted. |
| Date: | 2005 Aug 6 |
| Procedure: | Power-on neon lamp internally covered with metallization. Bulb replaced. 18K limiting resistor replaced with 56K. |
| Date: | 2005 Aug 7 |
| Procedure: | V+a filter capacitor (bathtub) and bleeder resistor had been previously replaced, replacements were poorly installed (inadequate support). 8µF/220K replaced with 4.7µF/390K and moved from location next to crystal oscillator to unused area on power supply board. |
| Date: | 2005 Aug 7 |
| Procedure: | Feet had hardened and flattened. Replaced. |
| Date: | 2005 Aug 8 |
| Procedure: | Power cord replaced. Hole for strain relief had already been manually trimmed. New lockplate to keep strain relief from turning installed. |
| Date: | 2005 Aug 8 |
| Procedure: | Tiny oil drops placed on all control shafts from front. |
| Date: | 2005 Aug 8 |
| Procedure: | Fully functional. |
| Serial Number: | 399 |
| Year of Manufacture: | Component date codes indicate 1961 (6124 on trimmer resistor) |
| Date of Receipt: | 2005 Aug 20 |
| State upon Receipt: | Quite clean. Some long scratches on side panels. Unit functional but most NIXIEs have only partial ignition on most numerals. On 10S Test mode, unit only counts to 200. |
| Date: | 2005 Aug 20 |
| Procedure: | Cursory cleaning. V+a measures ~ 270V to 310V. The only completely good NIXIE, in digit 10^2, shifted to 10^0. |
| Date: | 2006 Apr 1 |
| Procedure: | After an hour or two of being powered on, NIXIEs are much improved. |
| Date: | 2006 Apr 5 |
| Procedure: | 180µF capacitor for 10S timebase has corroded lead, same as on unit 398. Replaced with 220µF. Trimmer adjusted. |
| Date: | 2006 Apr 7 |
| Procedure: | Tiny oil drops placed on all control shafts from front. |
| Date: | 2006 Apr 8 |
| Procedure: | 18K limiting resistor for power-on neon lamp replaced with 56K. |
| Date: | 2006 Apr 8 |
| Procedure: | Crystal oven not warming up. Heater wire open around bend on base at pin 3. New lead installed from pin and heater wire soldered to it. Heater OK. |
| Date: | 2006 Apr 8 |
| Procedure: | Feet had hardened and cracked. Replaced. |
| Date: | 2006 Apr 8 |
| Procedure: | Cleaning completed, reassembled. Fully functional. NIXIEs are OK after some warm-up. |
| Date: | 2015 Jun 1 |
| Procedure: | Powered up, checked. Functional. NIXIE numerals on digits 10^1 to 10^5 still initially only partially illuminate, but are OK after 1/2 to 1 hour warm-up. |
| Date: | 2015 Jun 12 |
| Symptoms: | Powered up, snap heard and flash of light, no Nixie illumination. |
| Procedure: | 1N2070 anode-supply rectifier blown up, housing in pieces inside case. Replaced with 1N4007, 300VDC out. Checked first with R in series, filter capacitor seems to be OK. |
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.. | Transistor Specialties Inc. Apti-Meter 361 | ..
Early Digital Test Equipment |
bhilpert |