| |
KB2VXA > OLDSET 16.07.09 10:38l 22 Lines 744 Bytes #999 (0) @ WW
BID : 325_VK2TV
Read: GUEST
Subj: Re: ZL1ANM > vintage radios
Path: IZ3LSV<IK2XDE<DB0RES<WA7V<KD4YAL<VK2TV
Sent: 090716/0923Z @:VK2TV.#MNC.NSW.AUS.OC #:325 [Kempsey, QF68JX] $:325_VK2TV
From: KB2VXA@VK2TV.#MNC.NSW.AUS.OC
To : OLDSET@WW
Hi Neil and all,
Close, but no cigar. There was no appreciable hum in the audio output
unless there was a bad electrolytic as in any LV power supply. You forgot
the hum bucking coil connected to the heater string that phase cancelled
the ripple current in the speaker magnetizing/choke winding. If a
serviceman connected either backward they would sum rather than cancell.
One more thing on those P-P 6V6s I mentioned earlier, how about the
National Radio NC-183D that had two RF amps and P-P output?
http://www.io.com/~nielw/nat_list/nc183d.htm
73 de Warren
Station powered by JCP&L atomic energy, operator powered by natural gas.
Message timed by NIST: 09:23 on 2009-Jul-16 GMT
Read previous mail | Read next mail
| |
