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Philco model 511
#15

Well, I looked at the schematic of the Kolster K-27. At first, it appears that the Kolster transformer would substitute for the Philco 511 transformer.

But it won't. Why?

Notice the Kolster transformer's high voltage winding is 600 VCT (300-0-300).

After some searching, I finally found the Philco's ratings. Its high voltage winding is only 375 VCT (187.5-0-187.5).

To use the Kolster transformer would make the B+ run too high throughout the Philco, and would likely cause the B+ on the 71A plate to exceed its design ratings (180 volts max.).

You can do what you wish, but I personally would not do it.

Here are rough specifications for the Philco transformer. I can't guarantee the current specification of the high voltage secondary is correct, but 60 mA is greater than the total plate current draw of the entire set which according to Bulletin 5 adds up to just over 34 mA. Bulletin 5 specifies "30 mA per plate" on the plates of the 80 rectifier. Therefore, 60 mA was selected as a nice round figure. Anyone is, of course, welcome to add their two cents' worth to this. The filament currents were obtained from a tube manual - the 1.5V filament current is equal to the total filament current draw of four 26 tubes.

Primary - 125 volts AC, tapped at roughly 110
Secondary #1: 375 VCT (187.5-0-187.5), looks like 60 mA
Secondary #2 (26 tubes): 1.5V, 4.2A
Secondary #3 (27): 2.5V, 1.75A
Secondary #4 (71A): 5VCT, 0.75 to 1A? (0.5A for 71A tube plus additional current of pilot lamp)
Secondary #5 (80): 5V, 2A

--
Ron Ramirez
Ferdinand IN


Messages In This Thread
Philco model 511 - by radionut1929 - 08-14-2011, 02:42 AM
Re: Philco model 511 - by 7estatdef - 08-15-2011, 07:33 AM
Re: Philco model 511 - by radionut1929 - 08-15-2011, 10:16 PM
Re: Philco model 511 - by 7estatdef - 08-15-2011, 10:24 PM
Re: Philco model 511 - by codefox1 - 08-15-2011, 10:40 PM
Re: Philco model 511 - by radionut1929 - 08-16-2011, 12:18 AM
Re: Philco model 511 - by radionut1929 - 08-16-2011, 12:22 AM
Re: Philco model 511 - by Ron Ramirez - 08-16-2011, 07:58 AM
Re: Philco model 511 - by 7estatdef - 08-16-2011, 06:39 PM
Re: Philco model 511 - by gvel - 08-16-2011, 08:34 PM
Re: Philco model 511 - by radionut1929 - 08-18-2011, 06:11 AM
Re: Philco model 511 - by Ron Ramirez - 08-18-2011, 07:47 AM
Re: Philco model 511 - by radionut1929 - 08-21-2011, 05:40 PM
Re: Philco model 511 - by codefox1 - 08-21-2011, 05:52 PM
Re: Philco model 511 - by Ron Ramirez - 08-21-2011, 07:45 PM
Re: Philco model 511 - by radionut1929 - 08-22-2011, 03:12 AM
Re: Philco model 511 - by 7estatdef - 08-22-2011, 03:15 PM
Re: Philco model 511 - by Ron Ramirez - 08-22-2011, 03:30 PM
Re: Philco model 511 - by 7estatdef - 08-22-2011, 03:56 PM
Re: Philco model 511 - by Ron Ramirez - 08-22-2011, 03:58 PM
Re: Philco model 511 - by Eliot Ness - 08-22-2011, 05:37 PM
Re: Philco model 511 - by radionut1929 - 08-23-2011, 03:29 AM
Re: Philco model 511 - by Ron Ramirez - 08-24-2011, 03:16 PM
Re: Philco model 511 - by radionut1929 - 08-30-2011, 11:27 PM
Re: Philco model 511 - by Arran - 08-30-2011, 11:46 PM
Re: Philco model 511 - by Ron Ramirez - 08-31-2011, 11:05 AM
Re: Philco model 511 - by radionut1929 - 09-12-2011, 02:06 AM
Re: Philco model 511 - by Ron Ramirez - 09-12-2011, 10:37 AM
Re: Philco model 511 - by TA Forbes - 09-12-2011, 09:21 PM
Re: Philco model 511 - by radionut1929 - 09-12-2011, 11:33 PM
Re: Philco model 511 - by radionut1929 - 10-28-2011, 12:21 AM
Re: Philco model 511 - by jerryhawthorne - 10-30-2011, 01:26 PM
Re: Philco model 511 - by Ron Ramirez - 10-31-2011, 06:57 PM



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