Well have a long holoday from 10 Jan to the end of February 2012.Now we are offing a special offer to 25 Dec. The manual with 4 antenna swicheable ports: $3500, Auto tune: $5000 FREE ship to world wi
The direct heat filament/cathode only needs few secondsv to work. If power supply of filment without inrush current limiter or soft start, you'd better keep it turn on in half hour. a good idea if yo
We have a holiday special from now till Dec. 25. Our manual tune amplifier with 4 switchable antenna ports, $3,500. The auto tune version, $5,000. Free shipping included worldwide. Normal delivery ti
I have received many enquires about warranty. This amplifer with 2 years warranty and the tube one year in official. But Im not closefisted , if out of warranty, If just only small problem,Ill supply
Ebay China few Chinese use it. The best resource is taobao, www.taobao.com, I guess the uesers over hole USA. 73!Hsu ALL new production 572B's come from one factory in China and they will put any nam
The Chinese FU-728F first intruduce in 2005 or 2006 by myself in amps reflector. Before that year , as far as know,NEVER non-chinese had ever use and know it . In past years ,some homebrewers and amp
Dans amp use HV relay, Could anybody can tell me where can get the relay? here is the pictures http://www.oz7akt.dk/MyPowerAmp/Danamps/amp.htm 73Hsu _______________________________________________ Am
Happy newyear to everybody! I have no experience on building over 2kW amplifier.I'll try this project this year. I just get a brand new socket and will oredr some parts after new year. I think the re
I have a NOS brand new 4CX5000R(FU101F) and a FU-832F for sale. FU-832F similar 4CX10000J, but more cathode power (7.5V/123A) and smaller heat sink( same as 4CX5000R) , It was design for 10kW AM tran
-- From: Hsu Sent: Wednesday, January 11, 2012 7:11 PM To: rfamplifiers@yahoogroups.com Cc: amps@contesting.com ; ham_amplifiers@yahoogroups.com Subject: non-inductance resistors for sale Just find s
There are 3-4 manufacturers of 8877 in China,Jinguang( Jingdezhen), Hongguang(Chengdu) and VIC(Kunshan), I think Jinguang is the best. Jinguang and hongguang are the supplyer of the Force and state e
You can not identify the manufacturer , unelss you have ALL Chinese manufacturer's 8877 as reference. All Chinese tubes are marked the dealer's logo.No origional manufacturer's. 73!Hsu Unfortunately
Three NOS tetrodes+a brand new socket for asle. FC-10F, FC-732F, FC-735F, similar tube use same socket, can replace each other.But FC-735F with highter Uamax(3400V) and freqience rating( up to 1GHz)
I have a thought about shunt bleeder resistance ,If we use a HV MOSFET seial a resistor to replace it, when the negative screen current happened, control the total resistance so the screen voltage st
Hi Ian, Maybe I can not describ it clearly. Sorry for my bad English.I have read your article and the manuals carefully many years ago, very good job! But I do not think it can use my 4CX5000R projec
Hi Ian, This ia my thought , just a sketch, you can look it here: http://www.zmdz.com/bbs/incomefiles/20121/307105514796.JPG The top schematic is the traditional series regulator screen power supply.
Hi Carel, Your schematic diagram very clever thanks share with me. Hsu Hi, I am using some sort of shunt/linear circuit for grid supply (negative) in my tetrode amplifier. For the sake of this discus
Please Google Aryton-Perry winnding.I have use this way to wind a no inductance dumy load for my first 100W TRX. 73!Hsu Hi all I have a nice large 50 ohms wirewound resistor, which I would like to us
I have 20A 48V SMPS, I think I can get another one. Where should I look to purchase a 40 amp supply? Are there any deals on the web? Thanks Mike _______________________________________________ Amps m