[EMAIL PROTECTED] made an utterance to the drakelist gang ---------------------------------------------------------------------- I installed the capacitor in parallel with C163. However, a remarkable change did not occur. The +B line voltage rises when four vacuum tubes are pulled out. But I can't get 150 volts. I think that it is an overload though the cause is not understood. I get about -70 volts on AGC line when in standby mode. It is mostly same the -70 volts line voltage.
JA2JVC Ishii "Gerry" <[EMAIL PROTECTED]>： > >"Gerry" <[EMAIL PROTECTED]> made an utterance to the drakelist gang >---------------------------------------------------------------------- >With 115VAC secondary voltage, I would expect to see about 146 VDC at the >first electrolytic section. Minus 5.8 volts across R114, that gives about >140 volts, almost exactly what you saw. It's too bad you can't examine the >ripple voltage at the 150 volt (expected) point. So maybe the electrolytic >has expired. But don't they usually dry up and short to ground? Another >possibility might be that the load placed on B+ is more than expected and >this is causing high ripple, thus the lower DC voltage. If I remember >correctly, the Japanese line voltage standard is 100VAC/50Hz although there >are some areas using 60Hz. I know one of our offices in Osaka has 60Hz. So >that explains the necessary use of a variable voltage transformer. That's >why I asked about your line voltage in my first reply, in case anyone is >wondering. Maybe Drake was somewhat optimistic when they stated their AC >line requirement as being 50/60Hz. The transformer normally runs hot. At >50Hz, I would expect it to run hotter but I don't have any facts or figures >to give you, I always run my Drakes at 60Hz. Now, you might want to measure >the 6.3VAC heater voltage and see if it is within 5% of the spec at 120VAC. >That will tell you if the transformer was designed to work efficiently at >50Hz or not. > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] >Sent: Sunday, December 25, 2005 6:49 AM >To: [email protected] >Subject: [drakelist] R: R4C +B Voltage > > >[EMAIL PROTECTED] made an utterance to the drakelist gang >---------------------------------------------------------------------- >Hello >I am using a variable voltage transformer. Therefore, My R4C is supplied 117 >V. >Secondary Voltage is AC 115 V. Is this OK? >The value of R114 is 156.8 ohm. >Yesterday,I measured the voltage at both ends of R114 is 9 V. >Installed R114 again,It was 5.8 V. >Now, +150 V line voltage is about 139 V. >I do not have any high voltage rating electrolytic capacitors. >I will obtain some capacitors tomorrow. >The display of DVM changes violently. >It is not possible to read it. Therefore, I cannot measure the ripple >voltage. >(It thinks that it is 0.4 V.) >I do not know R4C completely new or adjusted. >I do not understand how much low +B voltage brings lower performance. > >73 Ishii > >---------------------------------------------------------------------- >Submissions: [email protected] >Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in >body >Hopelessly Lost: [EMAIL PROTECTED] - help in body of message >Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net >---------------------------------------------------------------------- > > >---------------------------------------------------------------------- >Submissions: [email protected] >Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body >Hopelessly Lost: [EMAIL PROTECTED] - help in body of message >Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net >---------------------------------------------------------------------- > ---------------------------------------------------------------------- Submissions: [email protected] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
