Edcor transformers g1
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Content:
- Funny how some projects get started.
- Low-Voltage Tube Amp Is Great For Beginners
- Analysis of plate to plate feedback SE amp
- Welcome To the Hoffman Amplifiers Forum
- Tube DIY Asylum
- diytube.com
- Announcement
- Results for "transformers" in Amps & Pedals in Canada
- A Nicely Designed Stereo Tube Amp
- Category: Rqu
Funny how some projects get started.
The amplifier is designed around the ECL82 tube, which includes both a triode and a pentode in one package. The ECL82 is practically an amplifier in a tube: it was designed for low-cost electronics like record players that needed to be as simple as possible.
The triode in the ECL82 is used as a pre-amplifier for the incoming signal. The pentode is controlled with the pre-amplified signal and acts as a power amplifier.
The last I heard, glass in made with silicon. Glass is silica based. Silicone is something different. The article is accuratein this respect. I think it would sound ok and also be a great circuit to mod, like adding a tonestack. Tubes are neat. One small issue with the schematic. No spec given for the output transformer. Yes, I could run the calculations, and figure out what would work, but I bet I am the exception in your audience.
Given that he is running on low voltage, and single ended, transformer choice is a bit far from typical. Could it really work in a single ended design like this?? I thought this kind of transformers would go into saturation so easily with the current going through the primary that would make them useless. In that case, which would be the best impedance to choose on the primary?
I used an output transformer from an old tube radio, but i dont have its specifications. I measured Ohms and 1. Of course it would be good to use an appropiate audio transformer with the calculated values, but tube amplifier audio transformers are quite expensive, at least for this little circuit. Dont expect no hifi-quality, but thats not the point, it just should work :.
In general I think projects benefit from a bill of materials. The grid-leak biasing scheme is not what I found recommended by tube gurus. Positive half-waves of grid signals could easily become non-linearly distorted due to grid-cathode circuit breaking into conduction. It would be nice to use a resistor in the cathode appropriately sized so its voltage drop would exceed the peak pentode driving voltage.
This way grid always remains negative with respect to cathode. The power output might suffer a bit. As noted in the article, running the PY88 heater at 6 volts means that the rectifier will give a very poor output. While the PY88 may be plentiful in some parts of the world and is a perfectly good rectifier normally, substituting a rectifier that uses a 6 volt or 6. As noted above,some idea regarding the output transformer would help. There are other tweaks that could be done too to improve the design, but the simplicity of this one would encourage newcomers to experiment.
You are comletely right. I made a small mistake in my description, the PY88 filaments gets the 30V it needs from the anode voltage trough a resistor so it heats like it should. Thank you for correcting this! I have corrected the mistake on the project page. They have higher-end transformers with endbells too, which are still pretty reasonably priced.
I wonder If someone knows why this happens and could expllain this?? Thanks in advance. Maybe just something grounding properly that wasnt before? Not positive if the output transformer shell is supposed to be grounded or not. If you want practical, use an integrated circuit. And a tube amp can look cool as well. Like semiconductor amplifiers, some tubes are rather more willing to turn themselves into oscillators than stable amplifiers.
For this reason tube amplifier stages sometimes employ series resistors in the grid circuits to help prevent spurious oscillations, especially for power tubes. This is usually manageable with careful lead dress and stopper resistors. Low transconductance tubes like the ubiquitous 12AU7, 6SN7 and so on are pretty immune to misuse.
Because you can is the best reason to do anything, if you want to. Interesting project. No problem feeding the heater of the ECL82 from the 40V with an appropiate resistor, no?
Kathode from pendode part of ecl82 is grounded but kathode from triode part of ecl82 is not shown on shematic? That is my point too. Could say there is a k or less bias resistor but yes schematic is inconclusive. Hey man reasoning like that are pushing this conversation into a philosophical area. Speaking of wich the entire mankind is useless because learning is simply not a valid reason according to youe reasoning. I tell you now: For humanistic reasons and pedagogic reasons.
Yes to learn about humanity and to experience first hand some material issue that has neen known to man before but might not have a direct practical purpose today. Why are people replicating stone tools today? To learn about humans in the past.
Can I try with just any tube that has the right voltage specified? I have a bunch salvaged. All of them are 8 volts have an 8 as the first digit.
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Learn more. Report comment. How would I go about modifying this example to produce 12vdc amps? Leave a Reply Cancel reply.
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Low-Voltage Tube Amp Is Great For Beginners
Return to Tubes, Parts, and Services. Users browsing this forum: Google [Bot] and 6 guests. Output transformer question Discussions of tubes, transformers, capacitors, and other discrete parts of radios, radio restoration and repair services. Ads are not permitted. The transformer will be connected in ultra linear mode. I have done tests using a 6,6K primary impedance audio output transformer and a ohm cathode resistor and things work ok, but I ran out of headroom in the driver stage.
Analysis of plate to plate feedback SE amp
This page attempts to explain the design of a SE tube amplifier from the initial concept to the finished product. I simplified the theory as much as possible. Some of the material presented here may be over the head of a beginner. Every design project must have some target, or goals and some constraints, usually size and budget. Some amplifiers like the Tubelab SE are designed with these constraints secondary and performance is the primary goal. In that case the output tube choices were already made 45's 2A3's and B's as were the driver tubes 's. It is the goal here for the completed basic amplifier to cost less than some people spend on tubes for a SE amplifier. It is also the goal for this amplifier to sound as good as any reasonably priced SE amplifier. This amplifier should have as much power as possible for a reasonable cost. Requests from potential users has dictated the use of cathode bias to eliminate bias adjustments.
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Tube DIY Asylum
Most of the work that [Ron] has done in the past with vacuum tubes and solid state electronics has been repair. At 59 years old, he finally put together his own stereo tube amplifier and we have to admit it definitely has an awesome look. The platform is built around the well-known 6V6 beam-power tetrodes which are mostly used by major audio brands for their guitar amplifiers nowadays. The output stage consists of two Edcor audio transformers one for each channel that converts the high voltage for its 8 ohms speakers. We are very curious to know if some our readers have been experimenting with glass tubes for audio applications.
diytube.com
The amplifier is designed around the ECL82 tube, which includes both a triode and a pentode in one package. The ECL82 is practically an amplifier in a tube: it was designed for low-cost electronics like record players that needed to be as simple as possible. The triode in the ECL82 is used as a pre-amplifier for the incoming signal. The pentode is controlled with the pre-amplified signal and acts as a power amplifier. The last I heard, glass in made with silicon.
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Results for "transformers" in Amps & Pedals in Canada
Funny how some projects get started. I was wandering around the little stalls that sell electronic parts under the train tracks in Akihabara. I often go to Japan on business, and usually find time to go to Akihabara to look around, see what s new, and pick up those few parts that are actually cheaper in Japan than in the US such as Alps volume control pots. In a stall that sells transformers and nothing else , I spotted a cool-looking little transformer in an enclosed black metal case. About the size of a 20W filament transformer, it stood out from the dozens of other power transformers.
A Nicely Designed Stereo Tube Amp
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Category: Rqu
Users browsing this forum: Google [Bot] and 3 guests. Posted: Fri Jan 18, pm. Hello, This thread is to help me figure out the redesign of an old kit that's labeled "Qual-Kit " from a mono push-pull to a single ended stereo amp: I will be using it to listen to music through some second hand polk speakers, mostly on the lighter side.
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