06-01-2016, 09:09 PM
In the 128 sch there is an error, a very typical tor Philco schematics: a missing tie dot.
The filtered SG bias network R57-R58-C46 should connect to 78 RF, 6A7 and 78 IF tubes. But due to the missing tiedot it only connects to 6A7 and the two 78 tubes connect to each other and nothing else.
Good check is looking into 18 sch as the two are nearly identical.
The filtered SG bias network R57-R58-C46 should connect to 78 RF, 6A7 and 78 IF tubes. But due to the missing tiedot it only connects to 6A7 and the two 78 tubes connect to each other and nothing else.
Good check is looking into 18 sch as the two are nearly identical.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
