04-06-2017, 12:05 AM
One gets the impression from the size of the chassis plate cutout for the front end that that was the original JTV chassis, re-used for the JTV2 and so leaving quite a large gap behind the more compact Fireball front end. I should have more information on the JTV within a moon or so. I managed to find copies of Hi Fi News 1958 September and 1959 June, both by now on the pigeons’ legs and heading this way.
Re the modified Fireball front end in the JTV2, I wonder how the valve positions compared with the standard UK version. The JTV2 had V1, the ECF80 (RF and MX) on the right looking from the front, and V2, the ECC81, on the left. I can’t find the information for the standard version. My guess is that on a minimum-change basis, Jason had just the mixer swap sides, which would indicate that normally the PCC84 (or ECC84) was on the right and the PCF80 (or ECF80) on the right.
As best I can determine the original Standard Coil Fireball was offered primarily as a neutrode type. But then Standard Coil normally offered different configurations for its turret and disc-type TV front ends. There were cascode and neutrode versions as might be expected, but even in the late 1950s, it was still possible to specify the (by then rather old) pentode RF plus double-triode (5J6 or 6J6) mixer-oscillator combination, although quite why anyone might want to do that is hard to fathom.
Cheers,
Steve
Re the modified Fireball front end in the JTV2, I wonder how the valve positions compared with the standard UK version. The JTV2 had V1, the ECF80 (RF and MX) on the right looking from the front, and V2, the ECC81, on the left. I can’t find the information for the standard version. My guess is that on a minimum-change basis, Jason had just the mixer swap sides, which would indicate that normally the PCC84 (or ECC84) was on the right and the PCF80 (or ECF80) on the right.
As best I can determine the original Standard Coil Fireball was offered primarily as a neutrode type. But then Standard Coil normally offered different configurations for its turret and disc-type TV front ends. There were cascode and neutrode versions as might be expected, but even in the late 1950s, it was still possible to specify the (by then rather old) pentode RF plus double-triode (5J6 or 6J6) mixer-oscillator combination, although quite why anyone might want to do that is hard to fathom.
Cheers,
Steve
