zenith: ZENITH "H511 Consoltone" description and repair
The RF - signal is picked up by the frame - antenna and coupled directly to g 3 of the Pentagrid Converter 12BE6. L1 in combination with section C2 of the twin variable capacitor form the tuned input circuit. Trim capacitor C1 serves for fine - tuning the …
Restoring a Vintage Zenith Table Top AM/FM Receiver from the …
The radio has a radio frequency (RF) amplifier for AM and FM, separate intermediate frequency (IF) sections for AM and FM, a mono power amplifier, and a midrange/tweeter speaker pair. The eight tubes and their functions in the radio are: 6BJ6 FM/AM RF amplifier; 12AT7 FM/AM mixer and FM/AM oscillator; 6AB4 FM automatic frequency control (AFC)
Zenith 5G500 and 6G501M Universal 3-way portables - Ohio …
Both Zenith portables use primarily loctal tubes with an octal 117Z6 rectifier. The 5G500 is a 5 tube radio with a 1LA6 as converter, 1LN5 as IF amp, 1LH4 as audio preamp/ detector, and 1LB4 as audio output. The 6G501M adds another 1LN5 as RF amplifier tube and changes the audio output tube to a 3Q5 which is an octal tube.
Old Radios Troubleshooting Quick Guide - antiqradio.com
Old Radios Troubleshooting Quick Guide How to detect old radio malfunction cause? The most common fault in antique receivers and their characteristic symptoms: Absence of Signals. Burnt out rectifier valve ; Broken down filter capacitors ; Open-circuit field winding or filter choke ; Short in H.T. by-pass capacitors ; Open circuit cathode resistors
Zenith 4-B-231 - RF Alignment (Boring But Necessary) - Part 10
Completing the RF alignment on the Zenith receiver.Thanks for watching and subscribing to my channel on vintage radio repair.
Zenith Trans-Oceanics - Radiomuseum
2014年12月8日 · Of the many products of Zenith Radio, the 'Trans-Oceanic' series of portable radios were amongst the most famous. McDonald was a keen yachtsman and outdoorsman and wished for a portable radio that would provide entertainment broadcasts as well as being able to tune into weather, marine and international shortwave stations too.
Repairing Antique Radio Electrics from Start to Finish (4 ...
2011年5月3日 · The center tap of the volume control goes through a DC-blocking capacitor, and then to the grid (input) of the first audio tube. The signal wire from an RCA cable can be connected to the same tap, and whenever the radio is tuned away from a …
10S464 10-S-464 Ch=1005 Radio Zenith Radio Corp.; Chicago
It does have a Local Distance switch which grounds a 10K resistor to the cathode of the 1232 RF amp tube for distance position. The other leads from the Wavemagnet to into the radio chassis also have errors.
popping & crackling noise from restored valve AM radio
2012年5月9日 · Check for a false contact in a tube, or in a tube socket. Try to strike the tubes with a short piece of plastic or wood, then listen the sound it makes. Also, check if it is not an external interference. Luck!!! I once had an old Zenith radio which developed similar crackling noises. I traced the problem to the IF transformers.
Robert's Projects: 1948 Zenith Trans-Oceanic radio
2010年12月4日 · The RF, IF and Audio signal circuits, stripped down the the bare minimum to illustrate how the signal passes through the radio. Only the Broadcast position is shown. The Oscillator circuit is by far the most complicated, and the most intolerant of weak tubes, batteries or other components.