Gi46b datasheet

I start at first with one Russian GI7B tube. I finished it in December I have no pictures any more from the building phase, but I can show you what I have. Here is the look from this linear. The under side from this linear In input circuit of the GI7B tube. The net filter on the V side. The tube was in a cooling case. The PI-Filter hat two switchable coils, because the roller induct-or was to small.

The power supply side with near Volt. The bias circurit. Sorry sorry still have it incorrect, here is the correct setting: 40 Meter Plate cap 5 Loading cap 0 ————————————— 20 Meter Plate cap 8 Loading cap 2. I atjust the bias with a unmodulated signal ptt onlyat that value in the milliamp meter, what the datasheet said.

It is obvious that either a burned contact or a bad padder capacitor is the cause of your load control all the way meshed and still not at peak power out. Good luck. Band switches are hard to find, and the new one may, due to bad design, have a parasitic pulse that will destroy your new, expensive band switch or padder caps.

As the saying goes- Junk it and buy an Alpha!!!!!!!! I have two, and love them. Bruce N4JHY, Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. It's only fair to share Sorry sorry still have it incorrect, here is the correct setting: 40 Meter Plate cap 5 Loading cap 0 ————————————— 20 Meter Plate cap 8 Loading cap 2 It seems as though the Loading cap needs a bit more uF.

Leave a Reply Cancel reply Your email address will not cardigan sweater patterns published.Your safety is YOUR responsibility. The information provided here is for information purposes only. No liability is assumed by providing you with this information. This page was started February 11, and the last update was on July 6, Latest update done on July 6, This project uses dangerous high voltages.

These voltages will not just shock you, they will kill you. Use extreme caution while building, working on and testing. Only YOU can prevent accidents. GSB Medium mu triode vacuum tube.

Please work safely. If you don't feel safe, step back and avoid the danger. Don't work on this kind of project while you are tired. Don't work alone. Don't work with the power on!

Remember, capacitors store energy and they can deliver a dangerous shock long after the primary power source has been removed. Keep one hand in your pocket. Mail Archive. Parts Lists. Tube Data. Tony's first rule for tubes: Tubes are like women If you feel that you must have two, keep them in separate houses, and don't let them know about each other.

If one isn't good enough for you, get a better one. In other words, if one tube isn't enough for you, don't run two, get a bigger tube! The next logical step above a single GSB isn't two of them It virtually eliminates the stray inductance in the grid circuit. Click on the picture to see the details of the construction. Tube Tester and Filament Burn In Jig - Here's my answer to cooking the tubes for days and then testing them before inserting them in an amp.

Note - I have learned an important lesson with this jig. The filament alone heats the entire bottom of this tube and even with the fan blowing air into the box, the bottom of the tube will get too hot to hold in your hand. This is an important lesson regarding cooling of the tube, particularly the grid ring and filament seals.I am writing to give information about a very special Russian-made transmitting valve, named Gi7B sounds like some special event station from Northern Ireland!

This is a coaxial-type valve, apparently developed to be primarily used in radar systems, but it is very useful for any frequency from zero to nearly 3GHz. It is a valve with ceramic insulation pink colour! Other electrical data are given in table 1. It is a directly heated triode, with the heater connections on two bottom round-type connectors, so it can be easily connected with the aid of appropriate shells.

Above that is the grid connection, which fits a brass or bronze machined flange fixed to the chassis with, say, four M3 screws, giving a very good ground connection for a grounded grid amplifier. Above that broad round area, below the heatsink, is a silvered metal connection for the plate, which could be realised with an appropriate shell. Naturally, this valve requires forced air cooling, with a good squirrel fan, to blow the part of the valve which is above the chassis.

Up to this moment it might sound like a fairy tale, until we discover how cheap and easily obtainable it is. Figure 3: G3MY's cooling chimney - a flower pot! If you order four valves, send the equivalent of DM. This is the limit for one order, since four well-packed valves weigh 1. If you need more, they will be shipped in two packages.

I am guaranteeing that the business is absolutely legal and no-one will lose any money. If they are sold out, cheques will be returned. One tip: after making the flange to fit the grid area of the valve, make a vertical cut in it and after dropping the valve in put an appropriate shell around the flange with the facility to tighten it with an M4 or 4BA screw.

That will keep the valve very firmly in place and ensure solid grounding of the grid. He has bought four of the valves, and writes:. My amplifier uses a fairly conventional grounded grid circuit with zener bias. My power supply is a full wave voltage doubler with V AC giving about 1. This and size limits me to the W output, but at 2. While we have no reason to doubt the bona fides of this offer, please note that the UKSMG can accept no liability for any problems you may have obtaining or using these valves.

To return to the archive page click here. Filament V 12 Skip to main content. Email to friends Share on Facebook - opens in a new window or tab Share on Twitter - opens in a new window or tab Share on Pinterest - opens in a new window or tab. Add to Watchlist. People who viewed this item also viewed. Picture Information. Mouse over to Zoom - Click to enlarge. Have one to sell? Sell it yourself. Get the item you ordered or get your money back.

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gi46b datasheet

Resume making your offerif the page does not update immediately. Add to Watchlist Unwatch. Watch list is full. No additional import charges at delivery! This item will be posted through the Global Shipping Program and includes international tracking.OK, Translate this for me please Interelectrode capacitance pF :. See note above. Anode voltage, kV:. Dissipation Watts :. Please see the note above for a better idea of what you can do with this tube.

These are the dimensions for the tube base and hole cutout that I use They have been converted to inches click on the picture to get a larger printable image in a new window. The GSB is a medium mu triode that yields about 13 db gain in amateur service.

Russian GI-7B Amp Conversion

These same specifications can be applied to the GS-7B not to be confused with the GI-7 which appears to be an old commercially produced version of the GSB. Although the GSB has the same base as this tube, it has a much smaller anode cooler and is rated for much less power. Amateur amplifiers have been built using this tube for every band from meters through 23 cm.

The so called "Specification Sheet" for the GSB was provided for the tubes as they were produced in the Union factory for the Russian military and select civil aviation customers. The factory was manufacturing the tube in such a manner as to guarantee their performance under the specified conditions. Use of this tube in the spectrum occupied by the amateur bands meters through 70 centimeters was never specified nor measured.

Imperical knowledge of the use of this tube by many amateurs indicates that for use in those amateur bands, with plenty of air flow, you can expect up to 2, watts plate dissipation plenty of air flow means more than the specified You can also exceed the rated anode voltage specification of 3, volts to as much as 4, volts.

The majority of users are operating their amps with anode voltages between 3, and 4, Volts. Caution should also be exercised when operating the tube with filament voltages that may go below the nominal If your line voltage drops enough to cause your filament voltage to go below this level, you should adjust the filament voltage so that it will stay at or slightly above Low filament voltage not only contributes to rapid tube failure, it will also cause your tube to have low output.

Some users claim to run the filament voltage as high as 14 volts. Unlike directly heated cathode tubes, significant loss of the oxide coating on the indirectly heated cathode can occur with low filament voltages.

gi46b datasheet

High filament voltage can significantly shorten the life of the tube. You may shorten the life of the tube slightly by raising the filament voltage but not nearly as much as you will shorten it running low voltage. Always provide for a method to test and adjust your filament voltage. This tube uses extremely dangerous high voltages. These voltages will not just shock you, they will kill you. Use extreme caution while building, working on and testing. Only YOU can prevent accidents. Tony, W4ZT.

Physical Characteristics.

gi46b datasheet

Minimum r equired Air flow.If your email program does not pick up the "drgavva" email link, his address is "drgavva" followed by " " and "gmail. Alternate email address is "ur4ll gmx. It is also possible to contact Dr Alex via Skypeaddress: alexgavva.

Parcel Tracking. The most popular QRO words in Russian and their translation you can find here. List of Categories for Items Offered click to go. Vacuum Capacitors not var. Original factory package. Can be used as a spare tubes. GU5B 2. GU48 kW glass triode. OK for HF and for audio as well.

gi46b datasheet

It is exact copy of Svetlana a Triode. GIb, W triode with abt 2kV plate voltage,W with 2. GIb without cooler Some designs with GI46b including z substitution: 123456. Similar to PL except the heater voltage is 6.

GS23B 1. Works up to MHz, Ua max 2. Base similar to GU43b. It will do 1KW on HF with no problem. Sometimes it works better than GU74b. Socket for 2 GU70b tetrodes 4cxb. GUB socket similar to above without anode clamp.I've constructed RF power amplifiers since I started in amateur radio nearly 50 years ago, my first transmitters and receivers were all homebrew.

My first actual designs were in a technical college electronics lab in the late 60's, where as a lab project associated with engineering courses I designed a grid driven neutralized PA stage. The was quite a large tube for me back then, and it was interesting learning how to use information in data sheets to calculate and estimate component values.

Over the years, especially with the recent decline in vacuum tube quality, I've come to firmly believe the only place to connect the grid in a grounded grid amplifier is directly to ground!

Restoration Drake L-4B Linear Amplifier by ALPHA TELECOM

The grid not only shields the input from direct RF feedback from the anode, it is also a good shield to prevent or minimize the anode voltage that might appear on the cathode during tube arcs. Floating the grid above ground is bad for RF, and bad for arc protection. The only thing preventing full anode voltage from appearing on the cathode of the Z is the ground on the control grid. The control grid ground is also the single most critical connection for stability.

The grid connection to ground should always be as wide and short as possible, and use as many pins as possible. An amplifier with the input applied between the cathode and grid and the output between the anode and grid is called a grounded-grid amplifier.

This is true even when the amplifier does not have a directly grounded grid. The grid RF reference point, which is the chassis ground, is the common reference for both input and output power. The input and output circuit of a grounded grid amplifier are connected in series through the tube. Plate current is common through both cathode and anode, and only dc plate voltage is not. Back when we measured power as plate input power and not RF output power, the FCC even had a rule similar to this.

The FCC wanted driver plate input power to be included as a full part of power amplifier plate input power. Thus kilowatt grounded-grid amplifiers, like the Heathkit SB, when driven by watt exciters could only run watts input if the operator wished to comply with FCC rules. Probably based more on FCC conservatism than actual operation, a few widely accepted handbooks and authorities claim driver power adds to output power via feedthrough and is not accounted for in the metering system.

Thinking unclearly, these books propose full driver power be deducted from output power when calculating efficiency. In actual operation, all extra current contributed by the exciter is fully accounted for in the plate current metering. The only thing not accounted for is a portion of the average cathode-to-grid voltage, which directly adds to the anode-cathode voltage during negative cathode swings. During positive cathode voltage excursions the gird is more negative compared to the cathode, so the tube cuts off.

This asymmetrical tube conduction causes the RF voltage between cathode and grid to contribute to amplifier output by adding effective anode-to-cathode voltage without the additional voltage showing on meters. If we look at this circuit we can see what that happens, because the anode and cathode are indeed in series! As in all series circuits, current is the same at all points in a mesh or loop. We only have to insert an anode current meter in the anode or in the negative rail of the HV supply to measure the full effect of drive power on plate input power.

The metering shortfall is confined to measuring effective anode-to-cathode voltage, since the meter connects from HV to ground to the grid, not to the cathode. The meter also cannot read the time-varying cathode voltage accurately because it is the wrong type of meter it can't read average voltage and it is connected across the wrong two points.

HV is read from grid to anode, while the signal source is in series with the HV supply, adding grid-cathode RF voltage to effective high voltage on negative swings of the cathode. Since the tube conducts heavily during negative cathode swings, that is also when the extra voltage provides the largest contribution to output power. With the output and input in series, a grounded grid amplifier has large amounts of negative feedback.