POPULAR TRIODES blue text tubes are ideal for HAM use
Type Number
FilamentMaximum RatingsTypical OperationMax. Freq.
for Full Ratings
VoltsAmpsPlate Diss.
kW
Pg. WEb, kVIb, AEb, kVIb, IAPo, kWGain dB
8873
6.33.0 240  0.252.20.42.00.30.315.3500
3CX400A7 / 8874
6.33.02400.452.20.42.00.30.315.3500
3CX800A7
13.51.52000.842.30.62.20.50.815.1350
3CPX800A7
13.51.52000.843.50.63.20.40.915.9500
7.5 21.0 200 1.2 50 5.0 0.8 3.6 0.7 1.5 12.5 110
3CX1200D7 / YU-121
6.3 25.0 200 1.2 50 5.5 0.8 4.0 0.6 1.6 14.8 110
3CX1200D7 / YU-181
6.3 25.0 200 1.2 50 5.5 0.8 4.0 0.6 1.6 14.8 110
YC-236
5.010.52001.5204.01.04.00.92.016.0250
3CX1000A7 / 8283
5.030.52001453.51.03.50.92.113.1220
5.010.52001.5204.01.03.51.02.115.1250
10.017.52005356.52.56.01.65.014.2110
3CX3000A / 8238
7.551.554506.02.55.51.15.114.5110
3CX3000F1 / 8239
7.551.554506.02.55.51.15.114.575
7.551.516042255.02.54.82.07.211.0110
3CX3000F7
7.550.516042255.02.54.82.07.211.075
7.551.52041506.02.56.02.110.018.775
3CX6000A7 / YU-148
7.078.020062257.03.55.72.510.012.2110
3CX10,000A3 / 8159
7.599.020102507.05.07.04.022.415.3160
3CX10,000A7 / 8160
7.5100.0200105009.04.07.63.722.511.7160
3CX15,000A7
6.3160.02001550010.05.07.04.625.59.9110
3CX20,000A7
6.3160.02002050010.05.07.84.227.510.8110
3-500Z
5.014.61300.5204.00.43.00.40.7414.0110
3-1000Z
7.520.02001506.00.76.00.73.213.2110
6.3 4.0 180  60 watts 8 1.5 0.175 1.5 0.16 0.16 13.0 30
6.3 4.0 170 160 watts 50 2.7 0.275 2.4 0.25 0.30 7.5 30

TETRODES
Type Number
Filament Maximum Ratings Typical Operation Max. Freq.
for Full Ratings
Volts Amps Plate Diss.
kW
Pg.1, W Pg.2, W Eb, kV Ib, A Eb, kV Ib, IA Po, kW Gain dB
8122
13.5 1.3 0.4 8 2.2 0.3 2.0 0.3 0.4 500
8F75R
7.0 64 4.0 9 4 11 21.0 220
6.0 2.6 0.3 2 12 2.0 0.3 2.0 0.3 0.4 21.3 500
4CX250BC / 8957
6.0 2.4 0.3 2 12 2.0 0.3 2.0 0.3 0.4 21.3 500
4CX250FG / 8621
26.5 0.5 0.3 2 12 2.0 0.3 2.0 0.3 0.4 21.3 500
4CX250R / 7580W
6.0 2.6 0.3 2 12 2.0 0.3 2.0 0.3 0.4 21.3 500
4CX300A / 8167
6.0 2.9 0.3 2 12 2.0 0.3 2.0 0.3 0.4 21.3 500
4CX350A / 8321
6.0 2.9 0.4 0 8 2.5 0.3 2.2 0.3 0.4 20.5 110
4CX350AC / 8321A
6.0 2.9 0.4 0 8 2.5 0.3 2.2 0.3 0.4 20.5 110
4CX350F / 8322
26.5 0.7 0.4 0 8 2.5 0.3 2.2 0.3 0.4 20.5 110
4CX350FJ / 8904
26.5 0.7 0.4 0 8 2.5 0.3 2.2 0.3 0.4 20.5 110
4CX150A / 7034
6.0 2.6 0.3 2 12 2.0 0.3 2.0 0.3 0.4 21.3 150
8560AS
6.3 2.6 0.3 2 12 2.0 0.3 2.0 0.3 0.4 21.3 500
4CX300Y / 8561
6.0 3.5 0.4 1 8 2.0 0.4 2.0 0.4 0.6 21.9 110
4CX400A
6.3 3.2 0.4 2 8 2.5 0.4 2.5 0.27 0.4 500
4CX600JB
6.0 5.4 0.6 1 15 3.0 0.6 2.8 0.6 1.0 20.0 30
4CX800A / GU-74B
12.6 3.6 0.8 2 15 2.5 0.8 3.2 0.63 0.8 150
4CX2500E / GU84B
27.03.72.51302.22.02.01.251.575
4CX800A / GU74B
12.63.60.82.50.83.20.630.8150
4CX1500B / 8660
6.010.01.51123.00.92.90.71.128.6110
4CX1000A / 8168
6.09.01.01123.01.03.00.91.620.0110
4CX1500A
5.038.51.525755.01.04.00.82.528.4150
4CX1600B / GU34B
12.64.41.63.31.42.40.872.1250
9.041.53.5501757.02.06.01.57.123.1150
4CX3500A
5.090.03.5501655.52.05.01.35.323.2220
7.575.05.0752507.53.07.02.212.520.7110
4CX5000R / 8170W
7.575.05.0752507.53.07.02.212.520.7110
4CX7500A
7.0110.07.5501657.53.07.02.413.020.1220
7.575.010.0752507.53.07.52.816.020.3110
4CX12,000A / 8989
6.5120.012.015030010.03.510.02.822.519.1220
6.3160.015.020045010.06.010.04.636.522.2110
4CX20,000A / 8990
10.0140.020.020045010.05.09.04.128.819.5110
9010 / YC-130
7.5160.018.020045010.05.010.04.636.522.2110
JRC    
4-250A
5.014.5.2510354.00.353.00.311.0110
5.014.7.410354.00.353.00.351.1110

 

Characteristics listed on this page are approximate, and for comparison only.

Links

Amp parts - Dr Alex - ebay alex550_2

Broadcast-Tubes

All Russian tubes

Power tubes

RF Parts - Tube list and specs

Tube specs & Equivs

Toroid specs Info.

Building a tube amp!

Its always a good idea to select a tube that is twice the power out you plan to use or more and run it at 50% or lower. This keeps it linear and very clean. A good linear amp should be no wider than the driver and in fact harmonics should be lower after the amp if it is well operated, designed and constructed. A tube linear amp should never draw grid current. This is the first sign of trouble and often splatter is a result of over driving small amplifiers.

Many people have used old commerical tubes where the tubes are taken out of service as there performance has dropped below spec. The only thing is the higher than necessary filament consumption. Grounded grid is ideal with some of these old tubes as tube amps are easy to build, very stable, robust and clean. Some of these old tubes are advertised from time to time on ebay.com and trademe.co.nz

Most of the splatter problems heard on Ham bands are the result of over driving amps and transceivers. A valve amp should never draw grid current. Its not the power level that causes splatter as even 5 watt QRP rigs can splatter if over driven in any of their RF stages. Now days you can use a $20 SDR dongle to monitor your signal on your PC.

Many are confused about SSB PEP power verse the power measured as on a Bird Watt meter.

1000 watts PEP / 2 *.707 = RMS power 352 watts

352 watts /.707 * 2 = 1000 watts PEP

600 ohm open wire spacing - dia of cable X 75

100 watt TV Peak sync analogue TV TX shows approx 62 watts on a Bird Watt meter on black screen ( ie no video)

NZ Ham Radio repairer - Colin Maddock - Ph 09 828 8261