Bulb Page

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Bulb Page

Here are some part numbers for replacement front panel bulbs.

12-09219: The official cross-reference is Chicago Miniature's CM2309, but many panels in people's collections use the equivalent Oshino OL-2.
OL-2/CM2309: 10V, 40ma, .05mscp, 5,000 hours -- The real deal. These were the "blue base" bulbs.; The OL-2/CM2309 was also used in the 54-08458 peripheral indicator panel.; Oshino OL-367BP is a newer part number for what appears to be the same bulb.
CM7371: 12V, 40ma, .12mscp, 10,000 hours -- approximately 36ma, .06mscp, 89,000 hours at 10V.; In stock at Mouser for $9.90 for 10 (last checked 12/2011).; These have been used in panels and seem to work well. The brightness is about 20% high, so you may want to do whole registers at a time to make them less noticeable.

12-09169: See Oshino's OL-1.
OL-1: 15V, 40ma, .075mscp -- The real deal. These were the "black base" bulbs.; The OL-1 was also used in the KA10 CPU front panel.
OL-6003BP: 15V, 37ma, .075mscp, 50,000 hours -- A very close substitute.; Mark G. Thomas found them at sunraylighting.com.
CM7003: 15V, 40ma, .075mscp, 2,000 hours.; I found some here (12/2011).
CM7370: 18V, 40ma, .15mscp, 10,000 hours -- These de-rate at 15V to approximately 36ma, .08mscp, 89K hours, so they should work well. Michael Thompson reports that they are also an excellent visual match to the OL-1 in PDP-8/i panels.; In stock at Mouser for $7.00 for 10 (as of 9/2012).

12-01741: See 1762F/CM1762.
1762F/CM1762: 28V, 40ma, .34mscp, 4,000 hours -- The real deal.; Unlike the ones above, it doesn't have a base. The wires just stick out of the glass at the bottom.; Some of these are available at www.donsbulbs.com (as of 12/2011).
CM2187: 28V, 40ma, .30mscp, 7,000 hours -- a close match for the original bulb.; In stock at Mouser for $4.90 for 10 (as of 12/2011).
CM7387: 28V, 40ma, .30mscp, 7,000 hours-- Like the CM2187, but with a bi-pin base. (Bi-pin bulbs have the advantage that they can be reliably socketed.); The bi-pin bulbs seem to fit the 8/S panel, but Doug Ingraham reports there is not enough vertical clearance in his straight-8. (A bi-pin bulb is 5/8" tall, my 8/S panel has about 3/4" clearance, and Doug's straight-8 has about 9/16" clearance.); In stock at Mouser for $8.40 for 10 (as of 12/2011).

12-01741: The TC01 uses modified 4910 and 4904 indicator brackets, which in turn hold Drake 11-504 or DialCo 39-28-375 or Eldema CF ZWT-1762 (per the PDP-5 manual). That last is equivalent to the 1762F. See PDP-8/S above.

12-09637: See Line-o-Lite 3590A20.
Line-o-Lite 3590A20: 12V indicator assembly. A white box and frosted panel, with a wire-lead bulb inside. From the circuit, we can conclude that a 12V, 80ma or less bulb must have been used. (The circuit is actually powered with 15V, however.)
CM2182: 14V, 80ma, .3mscp, 40,000 hours -- These are the bulb inside the white box of the indicator assembly.; In stock at Mouser for $3.01 for 10 (as of 12/2011).

12-02749 (most likely): The TU55 uses a similar indicator assembly to that later used in the TU56, but it is a 28V version. The markings on mine are "1090B44 28V", but the parts list says "1090B" which suggests perhaps a 1090B4-28V would be equivalent. The bulbs inside the assembly seem to be CM2187 equivalents. See PDP-8/S above.

12-09219 (most likely): See PDP-8/L above. I haven't been able to confirm this one.

12-09169: See PDP-8/i above. Michael Thompson reports no problems when using the CM7370 with TU20 panels.

12-12716: See GE 73.
GE 73: 14V, 80ma, T1.75 Wedge base W2.1x9.5d, 4 lumens,15000 hours. AKA GE 23015.

12-04734 (most likely): See Osram 6475. (The Spare parts list has "12V 18W P.T.RDR" hand-written.)
Osram 6475: A 12V 1.5A SV8.5-8 T4.75 1.77" 300 hour "festoon" bulb usually sold as an automotive dome light or license plate light.

Last updated on 02/25/23 02:21

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