How about 3200 volts AC... A transformer is AC not DC. Who know which type of a filter will be used! Can you please clarify? 73 Jim W7RY 1028, 1092A 3200 VDC @ 800 ma CCS ____________________________
They can sell for big bucks ($40-$50) on EBay. Good luck. 73 Jim W7RY The new Harbach filter board is installed and working. Now looking for a 2 pin connector to mate with the rear panel relay keying
Henry 3K (no suffix). Heart shaped meters. 3850 volts on the Eimac 3-500Z tubes. Nice shape, non smoker all stock. 1750 out with 106 watts drive on 40 meters. Covers 10-80 meters. $1800.00 Pick up in
Remove the . (period) from the end of the url and it will probably work better. 73 Jim W7RY Pics not found. Sent from my Verizon Wireless 4G LTE Smartphone Send Amps mailing list submissions to amps@
Jim, please show me where there are torroids in the Al-1200 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps No.
I completely agree that 6A10s are real overkill. 73 Jim W7RY FYI for next time, 6A10 diodes have become preferred by many for high power use because of their 6 amp continuous and 400 amp surge rating
Is there any other US plate transformer manufacutres in the US besides EPD and Heybooer that anyone would recommend buying a 2.8 KVA CCS transformer from? I have contacted EPD and I'm waiting for a q
Paul See the 3CX1500D7 amplifier project in the later versions of the ARRL handbook by Jerry K8RA. He uses a toroidal coil for both 80 and 160 meters. That may give you some ideas too. 73 Jim W7RY Us
There is little to no RTTY activity on 160 meters. 73 Jim W7RY ORIGINAL MESSAGE: (may be snipped) You are wrong regarding the loss. The loss isn't "essentially zero", unfortunately. Such a coil will
That is incorrect Bill. The schematic of the SB-1000 (an looking at the one currently on my bench) clearly shows the open interlock controls the one and only AC power relay to the rest of the amplifi
Probably work just fine. 73 Jim W7RY I have an AL-800H transformer, it is the only HV xmfr I have left. It looks like it will produce about 2250 VDC. I need to use it in another project to produce ar
Ameritron never offered a kit amplifier. They did supply Heathkit with the SB-1000 kit. I'm not sure who did what, but the Heathkit SB-1000 is an Ameritron AL-80A in kit form. Ameritron never sold th
What kind of coax? 73 Jim W7RY On 10/14/2013 9:17 AM, Louis Parascondola wrote: I performed what seemed to be a rather odd repair on an older Command Tech VHF-2000. I thought I would share this since
Has anyone had experience with EPD transformers? Pro or con? How do their prices compare? Thanks 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com http
I just received a quote from Heyboer. They are quite a bit cheaper for the same rating. And they returned my email requesting a qoute in less than a day. It took EPD 2 weeks to get back to me. Does a
I too have had those .01 6KV Chinese caps short. It can take a while but they eventually will short. They have about a 50% failure rate with me. Its a matter of when they short... Not if they short.
The TL-922 has 120 volts DC on the relay key line. And yes, it will weld the contacts shut on your radio. The relays on the TL-922 are very SLOW switching from transmit to receive. They frequently ho
What kind of power? What plate voltage and current on the tube? 73 Jim W7RY I'm curious because doing so would bring the loading cap requirement for a 4000-ohm plate impedance down to under 1000pF at
Jim... To figure the plate load impedance: RP = EP / 1.8 X IP 1.8 = K factor for class AB1 (Changes with ZSAC) RP = Plate Resistance EP = Plate Voltage IP = Plate Current 1.8 X .65 Amps = 1.17 1.17/
Ummmm... He's using an 8877. 73 Jim W7RY I found that this is far from the correct value for the 4CX1000A. Maybe it's closer for triodes like 8877s, maybe not. See <http://www.granta.g4axx.com/Linear