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807 amplifier frequency

The output signals characteristics are uniformly related to the input signals. It is tuned to a single fixed frequency which is the resultant of heterodyne action between a local oscillator frequency and a signal frequency introduced from an external source. The service was excellent. I can think of no improvements to date that you can make regarding internet sales.


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WATCH RELATED VIDEO: Heathkit Model WA-1, 20 Watt, 807 Vacuum Tube Amplifier Tests

807 electronic tube power amplifier circuit diagram


Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Pages: [ 1 ] Go Down. Author Topic: ModulatorW output Read times. Xnke Regular Contributor Posts: 69 Country:. Working on the audio portion of my new amateur radio transmitter, it's basically a 65W class AB1 audio amplifier. That said-this is not a hi-fi design! Once the basic concept is established as not immediately going to melt into slag the circuit presented here does not and actually works OK at the 45 watt power levels I've tested at I need to limit the frequency response.

I don't have a big enough 10K ohm resistor to properly load the secondary winding beyond 45W for more than a few seconds at a time. Now, even though the desired frequency response is hzKhz, I've made little attempt at limiting the bandwidth so far. I am very open to suggestions on: How to best limit the bandwith, restricting it to hzKhz range How to best apply some negative feedback around the whole amplifier.

I've never been particularly good at making this decision. Now, for the details: The 's are running V anode and V on the screens, and v fixed bias on the grids. They can provide a maximum of 72W of power to the modulation transformer primary, and operate in class AB Plate dissipation is not being violated at the idle conditions, and short of a key-down single tone test for tens of minutes not realistic they'll be fine. The modulation transformer will provide between 8.

It was actually designed for a military transmitter that used 's as the modulator tubes. The operating point was taken from the original schematic and backed off a bit. The 6BL8 input circuit is a very nice low-distortion design lifted from a 50W RCA audio amplifier, but it was designed for a 25v output swing. I have not gone through and checked the distortion at the 32 volt output level nor made allowances for the increased drive needed. The modulation transformer is as follows: 's drive a 8.

I don't have a 10K resistor to load this winding with beyond 45W output right now. The tertiary winding is a ohm centertapped winding that provides modulated screen supply voltage from the centertap to one leg, for the RF final. Thanks any suggestions! Circlotron Super Contributor Posts: Country:.

Yep, it's also crossposted to an AM Radio forum as well. My old teacher is still on this forum If there's a boneheaded mistake in there, I'm sure I'll hear about it. The old forum I would normally have posted this on is down due to software problems, and has been for a while.

First suggestion I've had has been to put some kind of current limiting in place in case one of the bias potentiometers goes open circuit-I'm thinking a 1 ohm resistor in the V line would allow me to trip a plate current relay if the current goes over, say, mA? That's more current than they should draw at full power, but not a lot more than they should draw at full power.

It would take a definite fault to get to mA. Theboel Frequent Contributor Posts: Country:. Quote from: Theboel on July 17, , am. Ah Ok, the glow of tubes never can be replace.

Where did you obtain the modulation transformer? This transformer was on Ebay-I have another just like it I got at a hamfest but it was so scratched up it was hard to tell what it was rated at. Modulation transformers are kinda like gemstones. You usually find them laying on the ground, but you don't just walk past one without picking it up! Pages: [ 1 ] Go Up. There was an error while thanking.

SMF 2. EEVblog on Youtube.


807 (vacuum tube)

Class-AB amplifier , push—pull. The is a beam tetrode vacuum tube , widely used in audio- and radio-frequency power amplifier applications. The plate voltage limit is volts and the screen grid limited to volts. Because of the volt screen grid voltage limit, the cannot be triode connected for high power applications. Failure to observe this precaution will cause screen grid failure.

The power tubes are more unusual: s—inexpensive, relatively low-power radio Claimed frequency response is 20HzkHz, and a low % THD at.

Altec Lansing 807-8a driver w 811b horn high frequency speaker 1970's Black


Welcome, Guest. Please login or register. Home Help Search Login Register. Pages: [ 1 ] 2. Author Topic: Single Ended amplifier Read times. Hi All The 's have been waiting to be used in a project. We decided to go for a Single Ended design that is simple and realisable with parts already in the workshop. The power transformer came from a Japanese tube PA, and the OPT were from a previous project that needed different transformers.

A 6J5-807, single ended, class A1 amplifier

807 amplifier frequency

When I was around 15 years old my father gave me a transistor amplifier in form of a kit, it was a small amplifier that gave only 2 W but I built it and had a lot of fun when i connected it to a home built speaker and a portable battery powered grammophon. Soon I wanted to have more power and I knew that my father had a lot of tubes in his workshop at our home. After promising to be careful with the high voltages he gave me some parts for an amplifier, it was two output tubes, a 6SN7GT driver tube, a high voltage transformer, a choke and his own hand built output transformer. As this was a mono amplifier I soon thought about building a stereo version but as I didn't had two output transformers I decided to wind my own. I found articles in some old electronic magazines and I decided to use split anode and output windings in order to get good frequency response.

Advice on Amp build.

tube amplifier kit 807


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6146B push-pull

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Read times. Pages: [ 1 ] Go Down. This is the single-ended amp for those who prefer transparency of conventional tube or solid-state design. Yet also has a lot of the "you-are-there palpability" that is associated with true DHT designs.

Return to Vintage Audio Equipment. Users browsing this forum: Google [Bot] and 5 guests. Ads are not premitted. Does anyone have a copy of a good williams design using 's and 6SN7's?

In this work, a V-band low noise amplifier LNA is developed in a commercial 0. Common-source CS topology, known to show a better noise performance than the cascode topology, was adopted and 4-stage was employed to achieve a sufficient gain at the target frequency near the cutoff frequency fT.

By mrquery , March 27, in Garage Sale. Hi All, I just bought this amp and they are wonderful sounding to say the least thus I am looking to get a match. I was told this puts out about 20 watts. Also appreciate if anybody can tell me a bit more information or history about this amp, thanks. Thanks, appreciate it much. Be VERY careful around those top caps - those are the plate connections and at several hundred volts Based on my limited research there are several hammond amplifier that look exactly like this.

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