Qst the care and feeding of a 3 500zg filament home up also of note. Some tubes are made to exhibit red color under maximum ccs or icas ratings. Operation with zero grid bias simplifies associated circuitry by eliminating the bias supply. The modern taylor 572b is virtually an exact copy of the original cetron 572bt160l tube. Electronic parts and equipment that we will no longer be able to acquire. The rf parts 3500zg is a compact power triode intended to be used as a zerobias class ab2 amplifier in audio or radiofrequency. Ameritron 3 500z replacement power tubes are available for allpurpose amateur radio service. The transmitting tube datasheets often contain text such as the plate shows a dull red color at maximum ccs ratings, or the plate shows a bright cherry red color at maximum ccs ratings or even shows an orange read color at maximum ccs ratings. These amperex tubes require about 1020% more rf drive than eimac or rf parts tubes for the same power output. Rf parts 3500zg taylor brand 3 500zg taylor brand tube 3 year limited warranty. Eimac no longer produces 3 500z or other glass tubes. We also sell taylor brand tubes, the taylor brand 3 500zg offers a two year warranty, and it is a very high.
This one came from an estate and appears to have never been put in service. Just ordered me a pair of matched 3 500zg machlett tubes from penta laboratories in california they had them on sale could not pass up the price. Typical operation cathode driven rf linear amplifier. In addition, groundedgrid operation is attractive since a. The eimac 3 500z is a compact power triode intended to be used as a zerobias classab2 amplifier in audio or radio frequency applications. Just purchased a matched set of rf parts 3500zg tubes for my kenwood. The rf parts 3 500zg transmitting tube is the highest quality transmitting tube that money can buy, for decades rf parts has been testing 3 500z tubes, and we only sell the best 3 500zg that pass our tube testing. The eimac 3 500z is a compact power triode intended to be used as a zerobias classb amplifier in audio or radiofrequency applications.
Look at the plate caps, no scratches or scrap marks. Amperex is an excellent graphite anode tube of quality equal to eimac 3500zg. Page 5 stone creek special 2 3 500z hf amplifier by william g. Discussion in amateur radio amplifiers started by nq1b, sep 19, 2018. An excellent graphite anode tube of quality equal to eimac 3 500zg. The rf parts 3500zg transmitting tube is the highest quality transmitting tube that money can buy, for decades rf parts has been testing 3 500z tubes, and we only sell the best 3 500zg that pass our tube testing. There are some from china, rfp, taylor, and selected. I have read that the rfp 3 500z is an exact copy of the eimac 3 500z. The most rugged version of the 3 500z tube available. Rf parts 3500zg taylor brand accessories tubes, 3500zg. Eimac 4400a rf amplifier stepstart softstart relay circuit for high voltage power supply duration. The eimac 3500z is a compact power triode intended to be used as a zero. Graphite anode tube of superior quality equal to eimac 3 500zg. I replaced the tubes with eimac 4cx1500b varians that were given to me.
They were also 2 3 year old newstock code dates from richardsons, who somewhat owns the amperex label and production. Graphite anode tube of superior quality equal to eimac 3500zg. Describe your experience with the rf parts 811s and tell us why you give it the rating you did required. I removed the old emiacs from my heathkit sb220 installed the taylors. Eimac was the original designer of 3 500z line, and is generally considered the standard for comparison. The emac 3 500z is a compact power triode intended to be used as a zerobias classab2 amplifier in audio or radiofrequency applications. Adjustment of the rf grid voltage to obtain the specified plate current at the. We have had good performance from greenstone tubes. I just checked with rf parts and they are out of nos amperex 3 500s. Nos eimac 3 500z shows up about once a month, taylor 3 500zg has an instant supply of tubes, of course. I have looked at rf parts and there are several to choose from. I am in the market for a matched pair of 3 500z tubes. I just replaced a pair of rf parts graphite anode 3500z tubes in a kenwood that were two years old, and had no emission left. Late production made in france, marked 3 500z 8802.
The emac 3 500z is a compact power triode intended to be used as a zerobias classab2 amplifier in audio or radio frequency applications. I always though the rf parts branded 3 500zg to be a good tube. Put the 3 500z tube, over each tube from the top to feel the flow of air. Sam in the united states, frank krize, k5svc operates the ebay store k5svc that sells machlett rf tubes, such as the 3 500zg. The eimac 3 500z is a compact power triode intended to be used as a zerobias classb amplifier in audio or radio frequency applications.
Life is about learning and helping others as we go about me, my name is sam moriarity and i am a ham radio operator ki6dtc. These heavyduty, graphiteplate 3 500zs are an updated version of the venerable vacuum tube that has been around for well over half a century. The problem with getting new hams to join the builder ranks is that there are not a great number of books that address this specific area. Adjustment of the rf grid voltage to obtain the specified plate current at the specified bias and plate voltages is. Both tubes should be equal in redness brightness and the percentage of redness on both tubes plate surface should be. Ameritron 3500z replacement power tubes 3800500gt free. The eimac 3500z is a compact power triode intended to be used as a. I got my match set of taylors 3500zg tube from rf part a few weeks ago. In addition, groundedgrid operation is attractive since. It has the white ceramic base and the anode cap is fused much like the amperex.
Datasheet search engine for electronic components and semiconductors. Each tube is fully tested by rf parts company prior to shipment. Operation with zero grid bias simplifiers assocated circuitry by eliminating the bias supply. All 3500z amplifiers use a grounded grid and drive the cathodes. Rf parts 3500zg rf parts brand 3 500zg tube rf parts brand 3 year limited warranty. The largest getter the one that everyone knows about is on the outside of the anode. Logged joe cro n3ibx anything that is breadboarded,black crackle, or that squeals when you tune it gives me. The 3 500z has three separate getters in different parts of the tube structure, each designed to operate at a different temperature and optimized to react with different gas molecules notably oxygen, nitrogen and hydrogen. He has an explanation, on his ebay auction pages, about the burn in time 24 hours that these chinese mfg. The newest series of the rf parts 3500zg is a fantastic tube. Rf parts rfp line is a quality graphite anode tube, and a copy of the eimac 3 500zg.
The eimac 8163 3 400z is a compact power triode intended to be used as a zerobias classb amplifier in audio or radio frequency applications. For the past several years we buy the rf parts taylor brand of the 3 500zg as its a very good tube. Also, in am transmitters, a lowemission rf amplifier tube can be shifted. By matt erickson kk5dr i have read in many articles, the lamentation over the lack of new hams that are building their own gear, and older hams who dont build anymore. The same set of 3 500zg s installed in an sb220 put out 50 watts with 2700 volts and 100 watts drive, on 80 meters. Rf parts stocks the sk406 in three heights 4, 414, 4 3 4. Current stock status at these ham radio outlet locations. The rf parts 3500zg is a compact power triode intended to be used as a zerobias class ab2 amplifier in audio or radiofrequency applications. I was thinking about two 8 in grounded grid configurations but now im thinking why not the pair of 3 500zg from rf parts. The elmac 3 500z is a compact power triode intended to be used as a zerobias class ab 2 amplifier in audio or radio frequency applications. Pdf hla 3 500z linear amplifier hla belden power cord. The 3 500z triode tube is shipped separately and must be installed, amplifier giving access to the interior of the rf section of the amplifier. I newer used 3 500zg before so i cant compare it to 8.
Late production made in france and marked 3 500z8802. Virtually an exact copy of the eimac 3500zg in both mechanical and electrical characteristics. A worldwide distributor for 34 years, rf parts has released an expansion of its online catalog at the newly expanded catalog provides an easy and efficient listing of product information, product applications and product ordering with the companys secure ordering system. The 5 calibers to claim the most powerful handgun in the world title reupload duration. Ameritron 3500z replacement power tubes dx engineering. Rf parts, an americanowned company in the usa has recently initiated new policies, regarding the export of our limited, vintage or rare electronic products. A good pair of matched 3 500z tubes with hv around 36003800 plate volts and 220240 ma grid current, you should get about 12001400 rf output into a dummy loadantenna. Replacing 3400 tubes with 3500 in a henry 2kd page 2. In addition, groundedgrid operation is attractive since power gain as high as twenty times can be obtained with the 3 500z. Penta labs 3500zg sheet matched data selected tubes.
1429 555 93 661 1458 805 128 1369 519 577 431 1277 102 1403 969 1177 447 502 484 897 421 551 676 1002 325 255 983 1043 1375 893 1113 395 752 920 309 1284 955