Vacuum Tube Ham
Is it feasible to construct a vacuum tube AM receiver capable of tuning into the VHF or even UHF bands?
If so, how? If not, why not? This is for all the hams and amateur radio techies out there.
Wow, great question…
It was generally not done, only FM was/is used in the VHF and UHF bands. You typically only see AM in the SW bands and up to 30Mhz (is this still SW?). I think VHF starts around 50Mhz and is where TV begins (less channel 1).
So your question is can a reciever decode an AM signal on those higher frequencies… simple answer is YES but it’s not practical due to the fact that higher frequencies tend to become “line of sight”. ie, they do not curve with the earth or bend around structures. So I would think that normal everyday interference would alter the Amplitude of the Carrier you are receiving, increasingly so on the higher frequencies.
If you are considering a mobile type transmiter/reciever then just forget it, as you drive the carrier amplitude will peek and plunge as you pass buildings if it were tuned to VHF. Hence the need to go to Frequency Modulation (FM) on those higher bands.
This is just my best guess… I would love to hear some HAMs opinion on this.
Vacuum Tube Inspection
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5x RCA Electron Ham Radio Vacuum Tube 26C6 $30.00 |
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Vintage amateur ham radio 1T4 receiver vacuum tube NOS $9.99 |
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Vacuum tube 3CX100A5 2C39 Eimac for ham VHF/UHF $3.99 |
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Vintage Silvertone 226 Globe Radio Vacuum Tube Ham $9.99 |
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Raytheon ST 80 Electron Vacuum Audio Ham Radio Tube NIB $4.00 |
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Sylvania 5U4GB Electron Vacuum Audio Ham Radio Tube NIB $4.00 |
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Raytheon 4D32 Electron Vacuum Audio Ham Radio Tube New $3.00 |
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4 RCA 6080 WA Electron Vacuum Audio Ham Radio Tubes NIB $5.00 |
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115 LOT VINTAGE TV TUBE VACUUM RAYTHEON RADIO HAM POWER $39.99 |
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Two Nos 6JF6 Ham Amp Radio Vacuum Tubes $3.95 |
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Two Used 6JS6 A/C Ham Amp Radio Vacuum Tubes $3.95 |
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General Electric 6KD6 NOS vacuum tube HAM RADIO $34.00 |
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Two Used El.Enterprises Jan 3B28 Ham Amp Vacuum Tubes $3.95 |
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Two Used Cetron Jan 6528A Ham Amp Vacuum Tubes $3.95 |
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Two Nos Untested 829B Ham Amp Vacuum Tubes $4.95 |
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scarce EIMAC 25T/6211 HAM RADIO VACUUM TUBE $9.99 |
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CERAMIC RECESSED 4-PIN VACUUM TUBE SOCKET PRE-OCTAL HAM $14.99 |
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Vintage Lot Of 100+ Vacuum Tubes – AUDIO/RADIO/TV/HAM $9.89 |
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Vintage Lot Of 110+ Vacuum Tubes – AUDIO/RADIO/TV/HAM $9.98 |
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Hickok 1605M Ham Radio VTVM Vacuum Tube Voltmeter $109.79 |
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Ham Radio, HP 410B Vacuum tube voltmeter ,VTVM $210.00 |
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5 12AU7A 12AU7WA NOS VACUUM TUBES AMP HAM RADIO $24.99 |
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Vintage Vacuum Tubes – Lot of 100+ – AUDIO/RADIO/TV/HAM $9.97 |
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Vintage Vacuum Tubes – AUDIO/RADIO/TV/HAM – Lot of 80+ $8.89 |
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NOS 6LQ6 6JE6C PHILIPS VACUUM TUBE HAM AMP RADIO $32.50 |
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NOS 6LQ6 6JE6C RAYTHEON VACUUM TUBE HAM AMP RADIO $32.50 |
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6LQ6 6JE6C 6MJ6 RCA VACUUM TUBE HAM AMP RADIO $32.50 |
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NOS 6LQ6 6JE6C ZENITH VACUUM TUBE HAM AMP RADIO $32.50 |
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Lot of 60 Vacuum Tubes 7 & 9 pin boxed, Ham, Radio, Amp $4.88 |
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HP 410B VACUUM TUBE VOLTMETER VTVM HAM RADIO $9.99 |
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VINTAGE HP VACUUM TUBE VOLTMETER 400D HAM RADIO $99.99 |
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5x GE Ham Radio Electron Vacuum Tube 6005 / 6AQ5W $15.00 |
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5x GE Ham Radio Electron Vacuum Tube 6136 / 6AU6WA $15.00 |
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AMATEUR HAM RADIO 8252W 4PR60C VARIAN Vacuum Tube $9.99 |
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Lot of 77 Vacuum Tubes for Radio, TV and Ham Vintage $79.99 |
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five 20LF6 HAM vacuum tube tubes Zenith 3 say Holland $9.99 |
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6DQ6A 6DQ6B 6DQ6B/6GW6 HAM vacuum tube radio 3 tubes $9.99 |
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6JB6A General Electric GE Ham radio vacuum tube sleeve $124.00 |
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6JB6A General Electric GE Ham radio vacuum tube sleeve $124.00 |
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6JF6 General Electric GE Ham radio vacuum tube sleeve $29.00 |
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6JF6 General Electric GE Ham radio vacuum tube sleeve $29.00 |
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6JB5 6HE5 General Electric GE Ham radio vacuum tube $34.00 |
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6JB5 6HE5 General Electric GE Ham radio vacuum tube $34.00 |
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6JB5 6HE5 General Electric GE Ham radio vacuum tube $34.00 |
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22JF6 General Electric GE Ham radio vacuum tube $8.00 |
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36 NOS Vacuum Tubes Ham Radio Receiver Amplifier $24.99 |
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Pair GE 5U4GB VACUUM TUBES HAM RADIO $19.99 |
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6JB6 Dumont Ham radio tube beam power vacuum tubes $14.00 |
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2 x 6JU6 Dumont Beam Power Vacuum Tube, for Ham Radio ? $28.00 |
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2x 6LH6A 6LH6 Amperex Ham radio vacuum tubes pair $8.00 |
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12GC6 RCA Ham radio vacuum tube $3.80 |
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Sleeve of 5 RCA 6883 Ham Radio Vacuum Tubes NOS $49.95 |
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SYLVANIA 6KV6A Ham radio power vacuum tube NOS $30.00 |
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1 x 6KV6A RCA Ham Radio Power Vacuum Tube NOS NIB $30.00 |
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RCA 6KD6 Ham radio power vacuum tube NOS $30.00 |
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Dumont 6JS6C Ham radio power vacuum tube NOS $30.00 |
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SYLVANIA 6JS6C Ham radio power vacuum tube NOS $30.00 |
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SYLVANIA 6LQ6 Ham radio power vacuum tube NOS $30.00 |
Tags: diy, electronics, radio, tube, tubes
By admin | 28. Jul 2010 | Vintage Stuff | No Comments »