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| Miniature Lamp Guide |
Bulbs are described by a letter indicating shape and a number that is an approximation of diameter expressed in eighths of an inch. For example, B-4 is "B" shape, 4 eighths or one half inch in diameter.
| Bulb Styles | B  | G  | GTL  | RP  | S  | T  | TL  |
| Bayonet Bases | BIDC 
 | BDC 
 | BSC  | PFDC  | BMN  |
| Flange Bases | FSMD  | FSCMD  | FSCMN  |
| Screw Bases | SMD  | SMN  | SC  | SI  |
| Miscellaneous Bases | MTP  | BP  | GMD  | SPTHD  |
| Lamp Base Legend | | BDC | Bayonet, dual-contact | FSMD | Flanged, submidget | SMD | Screw, midget | | BIDC | Bayonet, indexed dual-contact | GMD | Midget grooved | SMN | Screw, miniature | | BMN | Bayonet, miniature | MTP | Miniature two-pin | SPTHD | Screw, special thread | | BP | Bipin | PFDC | Prefocused dual contact | W | Wedge | | BSC | Bayonet, single-contact | SL | Slide (various sizes) | WSMN | Wedge, subminiature | | FSCMN | Flanged, single-contact, miniature | SC | Screw, candelabra | WT | Wire terminal | | FSCMD | Flanged, midget single-contact | SI | Screw, intermediate | | |
| Type | Bulb | Base | Volts
(V) | Current
(A) | Lifetime
(x1000 hrs) | | PR2 | B-3.5 | FSCMN | 2.38 | 0.500 | 15 | | PR3 | B-3.5 | FSCMN | 3.57 | 0.500 | 15 | | PR4 | B-3.5 | FSCMN | 2.33 | 0.270 | 10 | | PR6 | B-3.5 | FSCMN | 2.47 | 0.300 | 30 | | PR7 | B-3.5 | FSCMN | 3.70 | 0.300 | 30 | | PR12 | B-3.5 | FSCMN | 5.95 | 0.500 | 15 | | PR13 | B-3.5 | FSCMN | 4.75 | 0.500 | 15 | | 10 | G-3.5 | MTP | 2.50 | 0.500 | 3K | | 12 | G-3.5 | MTP | 6.30 | 0.150 | 5K | | 13 | G-3.5 | SMN | 3.70 | 0.300 | 15 | | 14 | G-3.5 | SMN | 2.47 | 0.300 | 15 | | 19 | G-3.5 | MTP | 14.40 | 0.100 | 1K | | 27 | G-4.5 | SMN | 4.90 | 0.300 | 30 | | 37 | T-1.75 | WSMN | 14.00 | 0.090 | 1.5K | | 40 | T-3.25 | SMN | 6.30 | 0.150 | 3K | | 43 | T-3.25 | BMN | 2.50 | 0.500 | 3K | | 44 | T-3.25 | BMN | 6.30 | 0.250 | 3K | | 45 | 5-3.25 | BMN | 3.20 | 0.350 | 3K | | 46 | T-3.25 | SMN | 6.30 | 0.250 | 3K | | 47 | T-3.25 | BMN | 6.30 | 0.150 | 3K | | 48 | T-3.25 | SMN | 2.00 | 0.060 | 1K | | 49 | T-3.25 | BMN | 2.00 | 0.060 | 1K | | 50 | G-3.5 | SMN | 7.50 | 0.220 | 1K | | 51 | G-3.5 | BMN | 7.50 | 0.220 | 1K | | 52 | G-3.5 | SMN | 14.40 | 0.100 | 1K | | 53 | G-3.5 | BMN | 14.40 | 0.120 | 1K | | 55 | G-4.5 | BMN | 7.00 | 0.410 | 500 | | 57 | G-4.5 | BMN | 14.00 | 0.240 | 500 | | 63 | G-6 | BSC | 7.00 | 0.630 | 1K | | 73 | T-1.75 | WSMN | 14.00 | 0.080 | 15K | | 74 | T-1.75 | WSMN | 14.00 | 0.100 | 500 | | 82 | G-6 | BDC | 6.50 | 1.020 | 500 | | 85 | T-1.75 | WSMN | 28.00 | 0.040 | 7K | | 86 | T-1.75 | WSMN | 6.30 | 0.200 | 20K | | 88 | S-8 | BDC | 6.80 | 1.910 | 300 | | 93 | S-8 | BSC | 12.80 | 1.040 | 700 | | 112 | TL-3 | SMN | 1.20 | 0.220 | 5 | | 130 | G-3.5 | BMN | 6.30 | 0.150 | 5K | | 131 | G-3.5 | SMN | 1.30 | 0.100 | 50 | | 158 | T-3.25 | W | 14.00 | 0.240 | 500 | | 159 | T-3.25 | W | 6.30 | 0.150 | 5K | | 161 | T-3.25 | W | 14.00 | 0.190 | 4K | | 168 | T-3.25 | W | 14.00 | 0.350 | 1.5K | | 219 | G-3.5 | BMN | 6.30 | 0.250 | 5K | | 222 | TL-3 | SMN | 2.25 | 0.250 | 0.5 | | 239 | T-3.25 | BMN | 6.30 | 0.360 | 5K | | 240 | T-3.25 | BMN | 6.30 | 0.360 | 5K | | 259 | T-3.25 | W | 6.30 | 0.250 | 5K | | 268 | T-1.75 | FSCMD | 2.50 | 0.350 | 10K | | 305 | S-8 | BSC | 28.00 | 0.510 | 300 | | 307 | S-8 | BSC | 28.00 | 0.670 | 300 | | 308 | S-8 | BDC | 28.00 | 0.670 | 300 | | 313 | T-3.25 | BMN | 28.00 | 0.170 | 500 | | 323 | T-1.25 | SPTHD | 3.00 | 0.190 | 350 | | 327 | T-1.75 | FSCMD | 28.00 | 0.040 | 4K | | 327AS15 | T-1.75 | FSCMD | 28.00 | 0.040 | 4K | | 328 | T-1.75 | FSCMD | 6.00 | 0.200 | 1K | | 330 | T-1.75 | FSCMD | 14.00 | 0.080 | 1.5K | | 331 | T-1.75 | FSCMD | 1.35 | 0.060 | 3K | | 334 | T-1.75 | GMD | 28.00 | 0.040 | 4K | | 335 | T-1.75 | SMD | 28.00 | 0.040 | 4K | | 336 | T-1.75 | GMD | 14.00 | 0.080 | 1.5K | | 337 | T-1.75 | GMD | 6.00 | 0.200 | 1K | | 338 | T-1.75 | FSCMD | 2.70 | 0.060 | 6K | | 342 | T-1.75 | SMD | 6.00 | 0.040 | 10K | | 344 | T-1.75 | FSCMD | 10.00 | 0.014 | 50K | | 345 | T-1.75 | FSCMD | 6.00 | 0.040 | 10K | | 346 | T-1.75 | GMD | 18.00 | 0.040 | 10K | | 349 | T-1.75 | FSCMD | 6.30 | 0.200 | 5K | | 370 | T-1.75 | FSCMD | 18.00 | 0.040 | 10K | | 373 | T-1.75 | SMD | 14.00 | 0.080 | 1.5K | | 375 | T-1.75 | FSCMD | 3.00 | 0.015 | 10K | | 376 | T-1.75 | FSCMD | 28.00 | 0.060 | 25K | | 380 | T-1.75 | FSCMD | 6.30 | 0.040 | 20K | | 381 | T-1.75 | FSCMD | 6.30 | 0.200 | 20K | | 382 | T-1.75 | FSCMD | 14.00 | 0.080 | 15K | | 385 | T-1.75 | FSCMD | 28.00 | 0.040 | 10K | | 386 | T-1.75 | GMD | 14.00 | 0.080 | 15K | | 387 | T-1.75 | FSCMD | 28.00 | 0.040 | 7K | | 388 | T-1.75 | GMD | 28.00 | 0.040 | 7K | | 397 | T-1.75 | GMD | 10.00 | 0.040 | 5K | | 398 | T-1.75 | GMD | 6.30 | 0.200 | 5K | | 399 | T-1.75 | SMD | 28.00 | 0.040 | 7K | | 502 | G-4.5 | SMN | 5.10 | 0.150 | 100 | | 555 | T-3.25 | W | 6.30 | 0.250 | 3K | | 656 | T-3.25 | W | 28.00 | 0.060 | 2.5K | | 680AS15 | T-1 | WT | 5.00 | 0.060 | 60K | | 682AS15 | T-1 | FSMD | 5.00 | 0.060 | 60K | | 683AS15 | T-1 | WT | 5.00 | 0.060 | 25K | | 685AS15 | T-1 | FSMD | 5.00 | 0.060 | 25K | | 715AS15 | T-1 | WT | 5.00 | 0.115 | 40K | | 715AS25 | T-1 | WT | 5.00 | 0.115 | 40K | | 718AS25 | T-1 | FSMD | 5.00 | 0.115 | 40K | | 755 | T-3.25 | BMN | 6.30 | 0.150 | 20K | | 756 | T-3.25 | BMN | 14.00 | 0.080 | 15K | | 757 | T-3.25 | BMN | 28.00 | 0.080 | 7.5K | | 1034 | S-8 | BIDC | 14.00 | 0.590 | 5K | | 1073 | S-8 | BSC | 12.80 | 1.800 | 200 | | 1130 | S-8 | BDC | 6.40 | 2.630 | 200 | | 1133 | RP-11 | BSC | 6.20 | 3.910 | 200 | | 1141 | S-8 | BSC | 12.880 | 1.440 | 1K | | 1143 | RP-11 | BSC | 12.50 | 1.980 | 400 | | 1184 | RP-11 | BDC | 5.50 | 6.250 | 100 | | 1251 | G-6 | BSC | 28.00 | 0.230 | 2K | | 1445 | G-3.5 | BMN | 14.40 | 0.130 | 2K | | 1487 | T-3.25 | SMN | 14.00 | 0.200 | 3K | | 1488 | T-3.25 | BMN | 14.00 | 0.150 | 200 | | 1490 | T-3.25 | BMN | 3.20 | 0.160 | 3K | | 1493 | S-8 | BDC | 6.50 | 2.750 | 100 | | 1619 | S-8 | BSC | 6.70 | 1.900 | 500 | | 1630 | S-8 | PFDC | 6.50 | 2.750 | 100 | | 1691 | S-8 | BSC | 28.00 | 0.610 | 1K | | 1705 | T-1.75 | WT | 14.00 | 0.080 | 1.5K | | 1728 | T-1.75 | WT | 1.35 | 0.060 | 3K | | 1730 | T-1.75 | WT | 6.00 | 0.040 | 20K | | 1738 | T-1.75 | WT | 2.70 | 0.060 | 6K | | 1762 | T-1.75 | WT | 28.00 | 0.040 | 4K | | 1764 | T-1.75 | WT | 28.00 | 0.040 | 4K | | 1767 | T-1.75 | SMD | 2.50 | 0.200 | 500 | | 1768 | T-1.75 | SMD | 6.00 | 0200 | 1K | | 1775 | T-1.75 | SMD | 6.30 | 0.075 | 1K | | 1813 | T-3.25 | BMN | 14.40 | 0.100 | 1K | | 1815 | T-3.25 | BMN | 14.00 | 0.200 | 3K | | 1816 | T-3.25 | BMN | 13.00 | 0.330 | 1K | | 1818 | T-3.25 | BMN | 24.00 | 0.170 | 250 | | 1819 | T-3.25 | BMN | 28.00 | 0.040 | 2.5K | | 1820 | T-3.25 | BMN | 28.00 | 0.100 | 1K | | 1821 | T-3.25 | SMN | 28.00 | 0.170 | 500 | | 1822 | T-3.25 | BMN | 36.00 | 0.100 | 1K | | 1828 | T-3.25 | BMN | 37.50 | 0.050 | 3K | | 1835 | T-3.25 | BMN | 55.00 | 0.050 | 5K | | 1847 | T-3.25 | BMN | 6.30 | 0.150 | 5K | | 1850 | T-3.25 | BMN | 5.00 | 0.090 | 1.5K | | 1864 | T-3.25 | BMN | 28.00 | 0.170 | 1.5K | | 1869 | T-1.75 | WT | 10.00 | 0.014 | 50K | | 1891 | T-3.25 | BMN | 14.00 | 0.240 | 500 | | 1892 | T-3.25 | BMN | 14.40 | 0.120 | 1K | | 1893 | T-3.25 | BMN | 14.00 | 0.330 | 7.5K | | 1895 | G-4.5 | BMN | 14.00 | 0.270 | 2K | | 2102 | T-1.75 | WT | 18.00 | 0.040 | 10K | | 2107 | T-1.75 | WT | 10.00 | 0.040 | 5K | | 2158 | T-1.75 | WT | 3.00 | 0.015 | 10K | | 2162 | T-1.75 | WT | 14.00 | 0.100 | 10K | | 2169 | T-1.75 | WT | 2.50 | 0.350 | 20K | | 2180 | T-1.75 | WT | 6.30 | 0.040 | 20K | | 2181 | T-1.75 | WT | 6.30 | 0.200 | 20K | | 2182 | T-1.75 | WT | 14.00 | 0.080 | 40K | | 2187 | T-1.75 | WT | 28.00 | 0.040 | 7K | | 2304 | T-1.75 | BP | 3.00 | 0.300 | 1.5K | | 2307 | T-1.75 | BP | 6.30 | 0.200 | 5K | | 2314 | T-1.75 | BP | 28.00 | 0.050 | 1K | | 2316 | T-1.75 | BP | 18.00 | 0.040 | 10K | | 2324 | T-1.75 | BP | 28.00 | 0.040 | 4K | | 2335 | T-1.75 | BP | 14.00 | 0.080 | 15K | | 2337 | T-1.75 | BP | 6.30 | 0.200 | 20K | | 2342 | T-1.75 | BP | 28.00 | 0.040 | 25K | | 3149 | T-1.75 | BP | 5.00 | 0.060 | 5K | | 6803AS25 | T-.75 | WT | 5.00 | 0.060 | 60K | | 6833AS15 | T-.75 | WT | 5.00 | 0.060 | 25K | | 6838 | T-1 | WT | 28.00 | 0.024 | 4K | | 6839 | T-1 | FSMD | 28.00 | 0.024 | 4K | | 7001 | T-1.75 | BP | 24.00 | 0.050 | 2K | | 7003 | T-1.75 | BP | 24.00 | 0.050 | 2K | | 7153AS15 | T-.75 | WT | 5.00 | 0.115 | 40K | | 7265 | T-1 | BP | 5.00 | 0.060 | 5K | | 7327 | T-1.75 | BP | 28.00 | 0.040 | 4K | | 7328 | T-1.75 | BP | 6.00 | 0.200 | 1K | | 7330 | T-1.75 | BP | 14.00 | 0.080 | 1.5K | | 7344 | T-1.75 | BP | 10.00 | 0.014 | 50K | | 7349 | T-1.75 | BP | 6.30 | 0.200 | 5K | | 7361 | T-1.75 | BP | 5.00 | 0.060 | 25K | | 7362 | T-1.75 | BP | 5.00 | 0.115 | 40K | | 7367 | T-1.75 | BP | 10.00 | 0.040 | 5K | | 7370 | T-1.75 | BP | 18.00 | 0.040 | 10K | | 7371 | T-1.75 | BP | 12.00 | 0.040 | 10K | | 7373 | T-1.75 | BP | 14.00 | 0.100 | 10K | | 7374 | T--1.75 | BP | 28.00 | 0.040 | 10K | | 7375 | T-1.75 | BP | 3.00 | 0.015 | 10K | | 7376 | T-1.75 | BP | 28.00 | 0.065 | 10K | | 7377 | T-1.75 | BP | 6.30 | 0.075 | 1K | | 7380 | T-1.75 | BP | 6.30 | 0.040 | 30K | | 7381 | T-1.75 | BP | 6.30 | 0.200 | 20K | | 7382 | T-1.75 | BP | 14.00 | 0.080 | 15K | | 7387 | T-1.75 | BP | 28.00 | 0.040 | 7K | | 7410 | T-1.75 | BP | 14.00 | 0.080 | 15K | | 7839 | T-1 | BP | 28.00 | 0.025 | 4K | | 7876 | T-1.75 | BP | 28.00 | 0.060 | 25K | | 7931 | T-1.75 | BP | 1.35 | 0.060 | 3K | | 7945 | T-1.75 | BP | 6.00 | 0.040 | 20K | | 7968 | T-1.75 | BP | 2.50 | 0.200 | 500 | | 8099 | T-1 | BP | 18.00 | 0.020 | 16K | | 8362 | T-1.75 | SMD | 14.00 | 0.080 | 15K | | 8369 | T-1.75 | SMD | 28.00 | 0.065 | 10K |
| Standard Line-Voltage Lamps | | Type | V | W | Bulb | Base | | 10C7DC | 115-125 | 10 | C-7 | BDC | | 3S6 | 120, 125 | 3 | S-6 | SC | | 6S6 | 30, 48, 115, 120, 125, 130, 135, 145, 155 | 6 | S-6 | SC | | 6S6/R | 115-125 | 6 | S-6 (red) | SC | | 6S6/W | 115-125 | 6 | S-6 (white) | SC | | 6T4.5 | 120, 130 | 6 | T-4.5 | SC | | 7C7 | 115-125 | 7 | C-7 | SC | | 7C7/W | 115-125 | 7 | C-7 (white) | SC | | 10C7 | 115-125 | 10 | C-7 | SC | | 10S6 | 120 | 10 | S-6 | SC | | 10S6/10 | 220, 230, 25 | 10 | S-6 | SC | | 6S6DC | 30, 120, 125, 145 | 6 | S-6 | BDC | | 10S6/10DC | 230, 250 | 10 | S-6 | BDC | | 40S11 N | 115-125 | 40 | S-11 | SI | | 120MB | 120 | 3 | T-2.5 | BMN | | 120MB/6 | 120 | 6 | T-2.5 | BMN | | 120PSB | 120 | 3 | T-2 | SL | | 120PS | 120 | 3 | T-2 | WT | | 120PS/6 | 120 | 6 | T-2.5 | WT |
| Indicator Lamps (each has a T-2 bulb and a slide base) | | Type | V | A | Lifetime (x1000 hrs) | | 6PSB | 6.00 | 0.140 | 20K | | 12PSB | 12.00 | 0.170 | 12K | | 24PSB | 24.00 | 0.073 | 10K | | 28PSB | 28.00 | 0.040 | 5K | | 48PSB | 48.00 | 0.050 | 10K | | 60PSB | 60.00 | 0.050 | 7.5K | | 120PSB | 120.00 | 0.025 | 7.5K |
| Neon Glow Lamps (operating circuit voltage 105-125) | | Breakdown Voltage | | Type | AC | DC | Bulb | Base | W | External Resistance | | NE-2 | 65 | 90 | T-2 | WT | 1/12 | 150K | | NE-2A | 65 | 90 | T-2 | WT | 1/15 | 100K | | NE-2D | 65 | 90 | T-2 | FSCMD | 1/12 | 100K | | NE-2E | 65 | 90 | T-2 | WT | 1/12 | 100K | | NE-2H | 95 | 135 | T-2 | WT | 1/4 | 30K | | NE-2J | 95 | 135 | T-2 | FSCMD | 1/4 | 30K | | NE-2V | 65 | 90 | T-2 | WT | 1/12 | 100K | | NE-45 | 65 | 90 | T-4 1/2 | SC | 1/4 | None | | NE-51 | 65 | 90 | T-3 1/4 | BMN | 1/25 | 220K | | NE-51H | 95 | 135 | T-3 1/4 | BMN | 1/7 | 47K | | NE-84 | 95 | 135 | T-2 | SL | 1/4 | 30K | | NE-120PSB | 95 | 95 | T-2 | SL | 1/4 | None |
Information derived from the 78th edition of the ARRL Handbook 2001, Copyright, 2000.
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Kirt
