11-23-2013, 09:56 AM
I have a 90 lowboy and it is a very good performer. Great sensitivity and selectivity.
The AVC action is excellent due to the use of the sharp cutoff 24A tubes in the RF and IF stages. Almost every station comes in at the same volume whether strong or weak, but the sharp cutoff tubes do sometimes cause cross modulation with very strong signals.
The only drawback of the 47 output when compared to a 42 or 6F6 is the low level speaker hum caused by the directly heated AC filament.
The AVC action is excellent due to the use of the sharp cutoff 24A tubes in the RF and IF stages. Almost every station comes in at the same volume whether strong or weak, but the sharp cutoff tubes do sometimes cause cross modulation with very strong signals.
The only drawback of the 47 output when compared to a 42 or 6F6 is the low level speaker hum caused by the directly heated AC filament.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
