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RADIO VACUUM TUBES EF86 / 6267 TELEFUNKEN PR pentode preamp audio stereo tuner $249.99 |
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Philips EL34 6CA7 SYN metal base pentode audio vacuum tube valve röhre TEST GOOD $239.81 |
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Lot of 6 pentode EL11 Telefunken Philips Tungsram 6E102 AV1037 radio vacuum tube $219.60 |
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RADIO VACUUM TUBES EF86 / 6267 PHILIPS PR pentode preamp audio stereo monoblock $99.99 |
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EL51 TESLA Vacuum Pentode Power / Output TUBE $99.99 |
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164xEF80 electron tubes valve röhre TUNGSRAM Vacuum Pentode RF/IF-Stage $99.00 |
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◄6 x NOS Telefunken EF805S special longlife version of EF85 vacuum pentode tube► $68.00 |
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2x MATCHED RARE 60′s 6F6M1 SOVIET TUBE Vacuum Pentode Power/Output 6F6M 6F6S $55.55 |
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257 Tube Heintz & Kaufman Vacuum Gammatron Pentode $55.00 |
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41xEF183 electron tubes valve röhre TUNGSRAM Vacuum Pentode RF/IF-Stage $48.00 |
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DF668 / DF 668 / 1AD4 / RFT VACUUM PENTODE TUBE TYPE NOS IN BOX QTY -10 $45.00 |
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2 x MATCHED RFT EL84 6BQ5 German pentode audio amplifier vacuum valve tubes 102% $44.20 |
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RADIO VACUUM TUBES EL41 / 6CK5 PHILIPS PR pentode preamp audio stereo monoblock $41.99 |
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2 x EL12n RFT vintage power pentode old radio vacuum tube röhren valvola Germany $40.00 |
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PAIR Philips SQ Holland 6086 Tubes NOS Vacuum Pentode Gold Pins 18042 $39.95 |
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CL6 TUNGSRAM Vacuum Pentode Power/Output TUBE NIB $37.99 |
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RADIO VACUUM TUBES 6GW8 / ECL86 VIKING triode pentode preamp audio stereo ham $37.99 |
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RARE VACUUM PENTODE POWER OUTPUT TESLA AL4N TUBE BOX $37.00 |
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21xPL82 electron tubes valve röhre TUNGSRAM Vacuum Pentode Power/Output $35.00 |
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6J7G Vacuum Tube GE NOS NIB Pentode CV1074 6J7 G $34.95 |
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Vacuum Tubes 14ea 6AU6 Sharp Cutoff Preamp Pentode $29.99 |
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RADIO VACUUM TUBES 6CH6 / EL821 MULLARD PR pentode preamp audio stereo $29.99 |
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CK5586 Tube RAYTHEON USA NOS NIB Vacuum Pentode DF703 5886 CK571AX $27.90 |
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RADIO VACUUM TUBES 6BM8 / ECL82 SYLVANIA triode pentode preamp audio stereo ham $25.99 |
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EL12n RFT NOS Vacuum Pentode Power Output TUBE / EL12 $24.99 |
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RADIO VACUUM TUBES 6N8 / EBF80 PHILIPS PR pentode preamp audio stereo amp ham $24.99 |
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RADIO VACUUM TUBES 6AK5 NATIONAL UNION MIL SPEC PR pentode preamp audio stereo $24.99 |
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RADIO VACUUM TUBES 6AN8 CHANNEL MASTER PR pentode triode preamp audio stereo ham $24.99 |
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6KG6A EL509 Vacuum Tube RCA Japan USED? Power Pentode Melos $24.95 |
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6AU5GT Beam Pentode Vacuum Tube $24.50 |
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RADIO VACUUM TUBES 6F6GT GE pentode preamp audio stereo valve ham swl receiver $22.99 |
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Vintage….RCA Model 815 Indirectly Heated Dual Pentode…Vacuum Tube $20.00 |
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RADIO VACUUM TUBES 6SJ7 GE PR pentode preamp audio stereo swl ham cb $19.99 |
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RADIO VACUUM TUBES 1U5 SYLVANIA PR pentode diode swl receiver battery radios ham $19.99 |
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RADIO VACUUM TUBES 6661 / 6BH6 AWV PR pentode preamp audio stereo ham swl valve $19.99 |
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RADIO VACUUM TUBES 12SK7GT PHILCO PR pentode vintage shortwave receiver ham aa5 $19.99 |
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NOS Sleeve of 5 RCA 6BR8 6BR8A 6FV8 6FV8A Triode Pentode Vacuum Tubes Tested NIB $19.99 |
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EF805 Valve Tube TELEFUNKEN NOS Vacuum Pentode $19.95 |
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6J7G Vacuum Tube Westinghouse Pentode CV1074 6J7 G – Used? $19.95 |
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21KA6 SYLVANIA MADE BEAM POWER PENTODE PAIR VACUUM TUBE EMISSIONS 103/104 $19.00 |
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RADIO VACUUM TUBES 6CM6 TUNG SOL PR pentode preamp audio stereo ham swl radios $18.99 |
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RADIO VACUUM TUBES 3V4 / DL94 SYLVANIA PR pentode t600b g500 h500 l600 5r40 $17.99 |
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RADIO VACUUM TUBES # 57 ST RCA PR pentode preamp audio stereo vintage receivers $17.99 |
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RADIO VACUUM TUBES 14A7 / 12B7 SYLVANIA PR LOKTAL pentode vintage receivers ham $17.99 |
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RADIO VACUUM TUBES 12SJ7GT RCA DELCO PR pentode vintage wood receivers ham swl $17.99 |
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RADIO VACUUM TUBES 6U8A / 6KD8 GE PR pentode triode preamp ham receiver swl $17.99 |
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RADIO VACUUM TUBES 6EA8 GE PR pentode triode preamp audio stereo ham swl valve $17.99 |
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RADIO VACUUM TUBES 12BY7A / 12BV7 SYLVANIA pentode preamp audio stereo ham swl $17.99 |
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RADIO VACUUM TUBES 6SG7 / VT-211 RCA PR pentode preamp audio stereo ham swl $17.99 |
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SUPER RARE RV12P2000 RFT Germany Vacuum Pentode Universal TUBE = PV1 $17.99 |
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EF40 Valve Tube Sylvania UK NOS Vacuum Pentode Audio $17.95 |
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EF83 Valve Tube MULLARD UK NOS Vacuum Pentode Audio $17.95 |
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RADIO VACUUM TUBES 6SS7 RCA PR pentode preamp audio vintage swl ham valve stereo $16.99 |
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RADIO VACUUM TUBES 6F6 TUNG SOL pentode audio ham radio swl stereo valve preamp $16.99 |
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RADIO VACUUM TUBES 6SK7 RAYTHEON PR pentode preamp audio vintage swl ham valve $16.99 |
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RADIO VACUUM TUBES 1U4 RCA PR pentode portable battery shortwave radios ham swl $16.99 |
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RADIO VACUUM TUBES 6EW6 SYLVANIA PR pentode preamp audio stereo swl ham valve $16.99 |
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RADIO VACUUM TUBES 7B7 PHILCO LOKTAL pentode ham radio receiver shortwave $16.99 |
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6689 Vacuum Tube Philips Holland NOS Audio Pentode E83F $16.95 |
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6CB6A/6CF6 RCA JAN 1969 SHARP CUTOFF PENTODE VACUUM TUBE 10 PACK UNUSED $16.50 |
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RADIO VACUUM TUBES 6AU6A / EF94 SYLVANIA PR pentode preamp audio stereo ham swl $15.99 |
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RADIO VACUUM TUBES 12BZ6 RCA pentode preamp audio stereo ham swl receiver $15.99 |
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PAIR 6GK6 Tubes NOS GE USA Vacuum Pentode $15.95 |
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5 Tested RCA 6AH6 7 Pin Vacuum Pentode RF/IF-Stage Tubes FREE SHIPPING $14.99 |
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RADIO VACUUM TUBES 6DC6 GE PR pentode preamp audio stereo ham swl receiver valve $14.99 |
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RADIO VACUUM TUBES 5749 W PHILIPS ECG PR pentode preamp audio stereo tuner ham $14.99 |
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4 Tested (2 Ken-Rad/2 RCA) 12SK7 Vacuum Pentode RF/IF Stage Controlling Tubes $14.99 |
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15 Vacuum Tube Marconi Radiotron NOS Pentode 1943 #15 $14.95 |
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PAIR 6AC7 Vacuum Tube Westing’ NOS Pentode 1852 VT-112 $14.95 |
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EL86 6CW5 Vacuum Tube Philips Holland NOS NIB Pentode Power Output $14.95 |
Pentode Vacuum
What is present situation in the field of electronics about the vacuum tubes of good old days?
Those diode, tirode, tetrode, pentode, TWT, magnetron, klystron, dynatron, and so on… What are they doing now? Are they still in use, or gone into the oblivion? It’s just my curiosity to know their fate. Can anyone there provide me any information about their present situation? Or any link to websites?
It appears that I have reached that time in life when the things that I know and love best have become relics of then”good old days”!
Thermionic devices are still in use. Tubes such as triodes, tetrodes and pentodes are useful where we need high power. If you need to generate 10′s of kWatts or megawatts for radio broadcast transmitters then thermionic devices are the way to go.
TWTs are still in use as broadband amplifiers used in satellite transponders, satellite earth stations and some radar applications.
Magnetrons, of course, are the power source in microwave ovens. They generate high powers with reasonable efficiency and can be pulsed to control the output power. Frequency stability is not a problem in ovens.
The klystron is in wide use a high power amplifier. It has uses in TV transmitters, and some radar transmitters. It’s use in satellite earth stations has been replaced by TWTs.
I only recall ever seeing one piece of equipment that used a dynatron. They were a bit like a thermionic version of a tunnel diode. I am sure that they were very noisy devices by today’s standards and I cannot imagine that they would be in use any more.
Blue Bottle Multi-Pattern Tube Condenser Microphone @ FrontEndAudio.com
