Tetrodes
Note:- Sometimes there is more than one data sheet, usually from different manufactuers. E.g. There are data sheets for the 4CX250B from Eimac, STC and Penta. Sometimes there are major differences between the data on the different manufactuers data sheets - you will need to resolve what is right.
- Tubes are listed in order of increasing dissipation. So the 4CX300Y is listed before the 4CX350A, since the 4CX300Y has a 400W dissipation
- Sometimes two or more tubes share the same data sheet - e.g Eimac 8873, 8874 and 8875.
- Eimac have one page summaries for most of their tubes on line, but you will not find full data sheets like on this site
| Manufacturer | Model | Summary | Anode dissipation | Cooling | Fmax | Notes |
| Russian | GU-13 | 100W | ??? | 30MHz | ||
| Eimac | 4-125A 4D21 | 125W | Radiation and forced air | 120MHz | 4-125 | |
| Eimac | 4PR125A 8247 | 125W | Radiation and forced air | - | - | |
| RCA | 4-125A 4D21 | 125W | Radiation and forced air | 120MHz | 4-125 | |
| Eimac | 8560A | brief | see notes | Conduction | 500MHz | 8560. The plate dissipation is limited by the heatsink. |
| Svetlana | 8560AS | 200W | Conduction | 500MHz | 8560 | |
| EEV | C1112 | 250W | Radiation and forced air | 110MHz | ||
| Eimac | 4-250A 5D22 | 250W | Radiation and forced air | 110MHz | 4-250 | |
| RCA | 4-250A 5D22 | 250W | Radiation and forced air | 110MHz | 4-250 | |
| GEC | CCS1 | 250W | Conduction | 500MHz | CCS1. Similar to the 4CX250B, but conduction, rather than air cooled. | |
| Eimac | 4CPX250K 8590 | brief | 250W | Forced air | 500MHz | 4CPX250K Pulsed tube. Can deliver in excess if 10kW with 10dB gain at 450MHz. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CS250R | 250W | Conduction | 500MHz | 4CS250. Similar to 4CX250R | |
| Eimac | 4CX250B / 7203 | brief | 250W | Forced air | 500MHz | 4CX250. The 4CX250B is very popular. 6.0 V heater |
| STC | 4CX250B / CV6136 | 250W | Forced air | 500MHz | 4CX250. | |
| Penta | 4CX250B/M | 250W | Forced air | 500MHz | 4CX250. An odd make. 4CX250B/M is a new one to me. | |
| Eimac | 4CX250BC / 8957 | brief | 250W | Forced air | 500MHz | 4CX250. The 4CX250BC is a premium quality 4CX250B, but needs a closer heater voltage |
| Eimac | 4CX250FG / 8621 | brief | 250W | Forced air | 500MHz | 4CX250. Identical to 4CX250B, except this has a 26.5 V heater. |
| Eimac | 4CX250K / 8245 | brief | 250W | Forced air | 500MHz | 4CX250. Coaxial mount. |
| Eimac | 4CX250M / 8246 | brief | 250W | Forced air | 500MHz | 4CX250. Coaxial mount. |
| Tesla | 4CX250M / RE 025 XM | 250W | Forced air | 1000MHz | 4CX250M 4CX250M Coaxial mount | |
| Eimac | 4CX250R / 7580W | brief | 250W | Forced air | 500MHz | See also the data sheet for the 8930 says it is electrically identical except for the larger cooler on the 8930, allowing greater dissipation. The 4CX250R is physically identical to the 4CX250B |
| Eimac | 4X150A (1960 issue) 4X150A (1970 issue) |
250W | Forced air | 150MHz (500MHz at reduced ratings) | 4X150. Identical to 4X150D except for heater voltage is 6.0V on this tube. | |
| Eimac | 4X150D (1960 issue) 4X150D (1970 issue) |
250W | Forced air | 150MHz (500MHz at reduced ratings) | 4X150. Identical to 4X150A except for heater voltage is 26.5V on this tube. Data sheet same as 4X150A. | |
| STC | 4X250 / CV2487 | 250W | Forced air | 175MHz | 4X250. Although electrically equivalent to the 4CX250B, the base seals must be kept below 175 deg C, whereas on the 4CX250B they are okay to 250 deg C. | |
| Eimac | 4CW300B | brief (local, page 16) | 250W | Water | 400MHz | 4CW300B 4CW300 No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Amperex | 7580W | 250W | Forced air | 500MHz | 7580. Same as 4CX250R i.e. a ruggidised tube. | |
| Philips | QB 3.5/750 | 250W | Radiation and air | 75MHz | ||
| Eimac | 4CX300A 8167 | brief | 300W | Forced air | 150MHz | 4CX300. A poor quality copy of the data sheet. |
| Raytheon | 4CX300A CK8167 | 300W | Forced air | 500MHz | 4CX300. | |
| Eimac | 4CX350A / 8321 | brief | 350W | Forced air | 110MHz | 4CX350. Good linearity. Identical to 4CX350F except for heater voltage. |
| Eimac | 4CX350F / 8322 | brief | 350W | Forced air | 110MHz | 4CX350. Good linearity. Identical to 4CX350A except for heater voltage. |
| Eimac | 4CX350FJ / 8904 | brief | 350W | Forced air | 110MHz | 4CX350. IMD performance better than 4CX350F. 26.5V heater. |
| Eimac | 8930 | brief | 350W | Forced air | 500MHz | Electrically idential to the 4CX250R / 7598W, but the larger anode ratiator allows higher dissipation with low air flow and pressure drop. |
| Eimac | 4CX300Y / 8561 | brief | 400W | Forced air | 150MHz | |
| Eimac | 4-400A | 400W | Radiation +Forced air |
110MHz | 4-400. Glass envelope, poor copy, but looks complete. | |
| RCA | 4-400A | 400W | Radiation +Forced air |
110MHz | 4-400. Glass envelope. This might not be a full data sheet, as it's only 2 pages. See also the Eimac 4-400A | |
| Philips | QB 4/1100 | 400W | Radiation +Forced air |
110MHz | Glass envelope | |
| unknown | Q450-1 | 450W | Conduction | 120MHz | ||
| Eimac | 4-500A | 500W | Radiation +Forced air |
110MHz | 4-500. Glass envelope. | |
| Mullard | QY4-500A | 500W | Forced air | 220MHz | ||
| Eimac | 4CX600B | As 4CX600F, except heater V. | 600W | Forced air | 500MHz | 4CX600. The same as the 4CX600F, except 6.0V heater. |
| Eimac | 4CX600F | brief | 600W | Forced air | 500MHz | 4CX600. The same as the 4CX600B, except 26.5V heater. |
| Eimac | 4CX600J / 8809 | brief | 600W | Forced air | 110MHz | 4CX600. Highly linear. The Y584 is a specialised version of this tube |
| Eimac | 4CX600JA / 8921 | brief | 600W | Forced air | 110MHz | 4CX600. Highly linear. |
| Eimac | 4CX600JB | brief | 600W | Forced air | 110MHz | 4CX600JB 4CX600. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CW800B | brief | 800W | Water | 500MHz | 4CW800. |
| Eimac | 4CW800F | brief | 800W | Water | 500MHz | 4CW800. |
| Svetlana | 4CX800A | 800W | Forced air | 150MHz | 4CX800. | |
| Amperex | 4-1000A / 8166 | 1000W | Radiation +Forced air |
110MHz | 4-1000. Glass envelope. See also Eimac 4-1000A | |
| Amperex | 4PR1000A | 1000W | Radiation +Forced air |
110MHz | 4PR-1000. Glass envelope, designed for pulsed use. | |
| Eimac | 4-1000A | 1000W | Radiation +Forced air |
110MHz | 4-1000. Glass envelope. See also Amperex 4-1000A | |
| Eimac | 4CPL1000B | brief | 1000W | immersion in liquid | --- | Pulse modulator, voltage regulator or switch |
| Eimac | 4CPL1000C | brief | 1000W | immersion in liquid | --- | Pulse modulator or switch |
| Eimac | 4CPL1000A | brief | 1000W | immersion in liquid | --- | Pulse modulator or switch |
| Eimac | 4CX1000A 8168 | brief | 1000W | Forced air | 110MHz | 4CX1000. Some (including me) believe this is a troublesome tube. |
| Eimac | 4CX1000K / 8352 | brief | 1000W | Forced air | 400MHz | 4CX1000. 4CX1,000K |
| Eimac | Y-477 | 1000W | Conduction | unknown | The anode dissipation is believed to be 1000 W, not 1500 W as stated. Check with Eimac. | |
| Eimac | 4CX1500A | brief | 1500W | Forced air | 150MHz | 4CX1500. There is also a Penta data sheet for this tube. |
| Penta | 4CX1500A | 1500W | Forced air | 150MHz | 4CX1500A 4CX1500. | |
| Eimac | 4CX1500B / 8660 | brief | 1500W | Forced air | 110MHz | 4CX1500. |
| Eimac | 4CX1500BC | brief | 1500W | Forced air | 450MHz | 4CX1500BC 4CX1500. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| RCA | 7213 | 1500W | Forced air | 1315MHz | ||
| Russian | 7213 | 1500W | Forced air | 1315MHz | ||
| Mullard | QY3-1000A | 1500W | Forced air | 800MHz | ||
| Eimac | 4CW2000A | 2000W | Water | 110 MHz | ||
| Philips | QBL 5/3500 | 3000W | Forced air | 220MHz | ||
| Eimac | 4CX3000A / 8169 | brief | 3500W | Forced air | 150MHz | 4CX3000 |
| Russian | GU-73B | 3500W | Forced air | 250MHz | ||
| EEV | 4CX5000A | 5000W | Forced air | 30MHz | See also the Eimac 4CX5000A / 8170 below | |
| Eimac | 4X5000A | 5000W | Forced air | 30MHz | 4X5000. Very old data sheet. Note its a 4X, and not a 4CX and has a frequency of maximum ratings of only 30MHz. See also the 4CX5000A / 8170 below | |
| Eimac | 4CX5000A / 8170 | brief | 5000W | Forced air | 110MHz | 4CX5000. Electrically identical to the Eimac 4CX10000D (8171), except for the later tubes increased anode dissipation. |
| Eimac | 4CX5000J / 8909 | brief | 5000W | Forced air | 100MHz | |
| Eimac | 4CX5000R / 8170W | brief | 5000W | Forced air | 100MHz | 4CX5000. |
| Eimac | 4CX7500A | brief | 7500W | Forced air | 220MHz | 4CX7500A 4CX7500. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Penta | 4CX7500A | 7500W | Forced air | 220MHz | Sorry, no Eimac data sheet - only this Penta one. |
|
| Eimac | 4CV8000A | 8000W | Vapor & forced air | 150MHz | This is a vapor cooled tube, which is quite rare at this size. | |
| Svetlana | 4CW10,000A 8661 | 10,000W | Water+forced air | 30MHz | 4CW10,000A 4CW10000A 4CW10000. Eimac model rated 12kW and 110MHz, Svetlana 10kW and 30MHz. So this is not the replacment Svetlana claimed. | |
| Eimac | 4CX10,000D 8171 | brief | 10,000W | Forced air | 110MHz | 4CX10,000D 4CX10000. 4CX10000D Electrically identical to the 4CX5000A |
| Eimac | 4CW10,000A 8661 | brief | 12,000W | Water + forced air | 110MHz | 4CW10,000A 4CW10000A 4CW10000. Svetlana model rated 10kW. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CW10,000B | brief | 12,000W | Water + forced air | 110MHz | 4CW10,000B 4CW10000B 4CW10000 4CW10,000 No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CX10,000J | brief | 12,000W | Forced air | 100MHz | 4CX10000 4CX10000J |
| Eimac | 4CX12000A / 8989 | brief | 12,000W | Forced air | 220MHz | 4CX12000 4CX12,000. 4CX12,000A There is also a Svetlana 4CX12000A data sheet though. |
| Svetlana | 4CX12,000A 8989 | 12,000W | Forced air | 220MHz | 4CX12000 4CX12000A | |
| Eimac | 4CX15,000A / 8281 | brief | 15,000W | Forced air | 110MHz | 4CX15000 4CX15,000 |
| Eimac | 4CX15,000J 4CX15000J 8910 | brief | 15,000W | Forced air | 110MHz | 4CX15000 4CX15,000 |
| Eimac | 4CX15,000R | brief | 15,000W | Forced air | 110MHz | 4CX15000 4CX15,000. See also Svetlana 4CX15000Rdata sheet. |
| Svetlana | 4CX15,000R | 15,000W | Forced air | 110MHz | 4CX15000R 4CX15,000R. | |
| Eimac | Y-863 | brief | 15,000W | Forced air | 220MHz | Y-863 No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 8989 | 15,000W | Forced air | 220MHz | Formally X-2219 | |
| Eimac | 4CX20,000A / 8990 | brief | 20,000W | Forced air | 110MHz | 4CX20000 4CX20000A See also older 8990 data sheet |
| Svetlana | 4CX20,000A / 8990 | 20,000W | Forced air | 110MHz | 4CX20000 4CX20,000A | |
| Eimac | 4CX20,000B | brief | 20,000W | Forced air | 30MHz | 4CX20,000B 4CX20000B 4CX20,000. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Svetlana | 4CX20,000B | 20,000W | Forced air | 30MHz | 4CX20000B 4CX20000 4CX,20000 | |
| Eimac | 4CX20,000C | brief | 20,000W | Forced air | 110MHz | 4CX20,000C 4CX20000C 4CX20,000. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Svetlana | 4CX20,000C | 20,000W | Forced air | 110MHz | 4CX20000 4CX20,000. | |
| Eimac | 4CX20,000D / 9015 | brief | 20,000W | Forced air | 110MHz | 4CX20,000D 4CX20000 4CX20000D. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CX20,000E | brief | 20,000W | Forced air | 110MHz | 4CX20,000E 4CX20000E 4CX20,000. |
| Eimac | 8990 | 20,000W | Forced air | 220MHz | Formally X-2213 | |
| Eimac | 4CX25,000A | brief | 25,000W | Forced air | 230MHz | 4CX25000 4CX25000A |
| Eimac | 4CX25,000C | - | 25,000W | Forced air | 110MHz | 4CX25000 4CX25000C |
| EEV | 4CW25000A | -- | 25,000W | Water | 110MHz full, 225MHz reduced | Does anyone have an Eimac data sheet for the 4CW25000A? |
| Eimac | 4CW25,000A | brief | 25,000W | Water | 110MHz | 4CW25,000A 4CW25000A 4CW25000. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CW25,000B | brief | 25,000W | Water | 110MHz | 4CW25,000B 4CW25000B 4CW25000. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CW30,000A | brief | 30,000W | Water | 110MHz (220MHz reduced) | 4CW30000 4CW30000A |
| Eimac | 4CX30,000G | - | 30,000W | Forced air | 110MHz (CW) 230MHz (TV) | 3CX30000 4CX30000G |
| Eimac | 4CV35,000A | . | 35,000W | Vapor | 110MHz | . |
| Eimac | 4CX35,000C 8349 | brief | 35,000W | Forced air | 30MHz | |
| Eimac | 4CX40,000GM | brief | 40,000W | Forced air | 250MHz | 4CX40,000GM 4CX40000GM 4CX40000. No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CV50,000E | brief | 50,000W | Vapor | 110MHz | 4CV50000E 4CV50000 |
| Eimac | 4CV50,000J | brief | 50,000W | Vapor | 110MHz | 4CV50,000J 4CV50000J 4CV50,000 No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CW50,000E | brief | 50,000W | Water | 110MHz | 4CW50,000E 4CX50000E 4CW50000 No FULL Eimac data sheet - can you supply one? If so please upload the file(s) |
| Eimac | 4CW50,000J | brief | 50,000W | Water | 110MHz | 4CW50000 4CW50000J |
| Eimac | 4CW100,000E | brief | 100,000W | Water | 108MHz | 4CW100000E Needs SK-2100 water jacket. |
| Eimac | 4CW150,000E | brief | 150,000W | Water | 108MHz | 4CW150000E 4CW150000 |
| Eimac | 4CV250,000B | brief | 250,000W | Vapor | 50MHz | Great for QRP 4CV250000B |
| Eimac | 4CW250,000B | brief | 250,000W | Water | 50MHz | Great for QRP 4CW250000B |
| Eimac | 4CM300,000GA | brief | 300,000W | Multiphase Water+vapor |
50MHz (110MHz reduced) |
|
| Eimac | 4CPW1000KA / 9009 / X-2026K | brief | 1MW | Water | --- | No good for QRP as this is a switch tube. |
| Eimac | 8973 / X-2170K | brief | 1MW | Water | 110MHz | The ultimate tube for QRP |
