10-01-2023, 04:37 PM
Mike;
Back in 1929-30 the 71A was nearly obsolete, whereas the #45 was the latest, and greatest, thing, Philco never used anything without looking at a balance sheet, they literally designed sets around whatever they could get cheapest at the time or in quantity. As for what the audiophools are willing to pay they really are fools with the 171As, you can't even get one watt out of a single ended one, and the plate voltage maxes out at 150 vdc. The only good thing about them is you can use them as the power output on a 1920s battery set since they are a 5 volt tube that only draw .25 amps.
Regards
Arran
Back in 1929-30 the 71A was nearly obsolete, whereas the #45 was the latest, and greatest, thing, Philco never used anything without looking at a balance sheet, they literally designed sets around whatever they could get cheapest at the time or in quantity. As for what the audiophools are willing to pay they really are fools with the 171As, you can't even get one watt out of a single ended one, and the plate voltage maxes out at 150 vdc. The only good thing about them is you can use them as the power output on a 1920s battery set since they are a 5 volt tube that only draw .25 amps.
Regards
Arran
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
