Miniature Lamp Drawings & Specifications
Bulb Styles
B Miniature lamps lamp drawings "B" - RF Cafe G Miniature lamps lamp drawing "G" - RF Cafe GTL Miniature lamps lamp drawing "GTL" - RF Cafe RP Miniature lamps lamp drawing "RP" - RF Cafe S Miniature lamps lamp drawing "S" - RF Cafe T Miniature lamps lamp drawing "T" - RF Cafe TL Miniature lamps lamp drawing "TL" - RF Cafe
Bayonet Bases
BIDC Miniature lamps lamp drawing "BIDC" - RF Cafe
Miniature lamps lamp drawings drawing 		BDC Miniature lamps lamp drawing "BDC" - RF Cafe
Miniature lamps lamp drawings drawing 		BSC Miniature lamps lamp drawing "BSC" - RF Cafe PFDC Miniature lamps lamp drawing "PFDC" - RF Cafe BMN "BMN" miniature bulb - RF Cafe
Flange Bases
FSMD
Miniature lamps lamp drawing "FSMD" - RF Cafe		 FSCMD
Miniature lamps lamp drawing "FSCMD" - RF Cafe		 FSCMN
Miniature lamps lamp drawing "FSCMN" - RF Cafe
Screw Bases
SMD
Miniature lamps lamp drawing "SMD" - RF Cafe		 SMN
Miniature lamps lamp drawing "SMN" - RF Cafe		 SC
Miniature lamps lamp drawing "SC" - RF Cafe		 SI
Miniature lamps lamp drawing "SI" - RF Cafe
Wedge Bases
WSMN
Miniature lamps lamp drawing "WSMN" - RF Cafe		 W
Miniature lamps lamp drawing "W" - RF Cafe		 SL
Miniature lamps lamp drawing "SL" - RF Cafe
Miscellaneous Bases
MTP
Miniature lamps lamp drawing "MTP" - RF Cafe		 BP
 Miniature lamps lamp drawing "BP" - RF Cafe		 GMD
Miniature lamps lamp drawing "GMD" - RF Cafe		 SPTHD
Miniature lamps lamp drawing "SPTHD" - RF Cafe

Traditional incandescent miniature lamps (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. Profile sketches of the most popular glass domes and metal bases are provided for visual identification, and they are also useful in engineering drawings (right-click on image and copy to your clipboard). These bulb types are found mostly in equipment manufactured prior to the early 2000s, because they have been replaced with more energy efficient and longer lasting white LEDs (which are actually blue LEDs with a phosphor coating to obtain a wide spectral content). Sources such as Digi−Key and Amazon still carry most of these bulbs, both incandescent and LED equivalents.

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.

 

 

Posted September 12, 2023
(updated from original post on 10/22/2008)