6bw6 push pull amplifier theory
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1201pannari1904 Pannari 3
Fortunately Mr Millett has done a lot of the hard work for us It really does date from more than a decade ago:- Audio Asylum Thread Printer This guy adds a bit of convincing explanation:- The Solid State Tube here too:- Valve Technology Triode strapped pentode low distortion split load invertors concertina therefore produce extremely low distortion,- mostly 2nd harmonic and this will cancel out in the final stage also.
Indications are a likely distortion level below 0. Why did they sound so awful, with masses of hum and distortion? They must have been designed on a beer mat. Working out what on earth is really inside the budget valves of course is a whole story of tea, late nights and Sherlock Holmes Did they suffer from terrible quality control or was it just the marketing dept, got it wrong and stuck them all in the wrong places?
The ECL83 has a high mu triode, the equivalent of which I literally can find nowhere.. Mu Actually Bogen should have run the old heater at more like 60V off ground to be correct but they didn't bother, choosing to have this large potential difference internally right across the whole thing on AC. That's a sure way to lose about half your signal before you start Maybe the smart way would be to put a UCL 83 in there finally, stack the heaters of both sections up at about V and use the hi mu triode as the upper part of a cascode adventure in the input section The pentode bit I will get around to in a minute.
So this is the the Sherlock Holmes bit:- Nobody gives any inkling as to what the pentode is in the ECL83, no equivalents at all nothing! In fact the triode resembles nothing else either really There's a good reason for this. This little ECL83 has got itself inside a lot of little headphone amps, and there has to be reason apart from being so small.
I shuffled through all the normal candidates. EL84, 6BQ5 etc Then a little cryptic note came up "The EL85 appears to be the little brother of the EL84 pentode" The problem is, that family is rather big, so trying to find anything which looks remotely like it is a tough task, but that has got to be in the right ball park, and not off into the 6V6 family which it resembles a whole lot.
Here is the whole 6V6 family. Officially it's tied up as an EL90 or something like that and the roots go back to Funnily enough it's all in a page in German a language I speak fluently Die 6V6 - Familie So to use the rules of elimination here we go:- This gets really confusing!
EL90 is direct replacement for 6AQ5 which was claimed as the same as a 6V6. The 6BW6 is a 6V6 in a noval base. Here we go again here are the EL83 and EL82! Last edited by mullered; 18th April at PM. So what was all that about? The sheet pentodes in triode mode quotes the figures as the following:- These look like a quite low gain triode,- UCL83 Mu 9,4 gm 4. This higher gain triode is clearly to make up for the low gain of the pentode Last edited by mullered; 19th April at AM.
It is in fact an ancient budget design of lower output valve which goes right back to the dawn of mass radio. This is why it would seem to have these larger spacing of internal grids and lower gain more in common with the equally ancient 6V6.
To get some history on this little sleeper, it came from the EL An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this. Last edited by mullered; 19th April at PM. Interesting coincidence I was just reading all about you about 5 mins ago, then you suddenly posted all this. I wanted to ask a number of questions in fact about the driver, because I had come up with really viable designs built around the elements I discussed above.
The principal problem being the filament of the ECL83 will have to float BOTH halves ideally around v up , so you can see where that is inevitably leading. In any case if it's going to blow up, it's going to blow up anyway, - the fuses are also in series, so one amp slides into an abyss, and the fuses are going to go, they both shut down instantly much faster than fast. I think the has a totally undeserved reputation for unreliability.
The scariest ones were always those crappy old EL34s with the screen grids melting Mullard designed them to fail! All the GEC TT21 and other stuff was so well built, you could have a major "event" and still everything would be in one piece.. I had 2 old KT88 submarine PA amps like that, and you could get the anodes to glow red for hours with no worries at all!
These seem very much the same, and they are being run with the same loads but hardly get warm. They are part of a surround sound system anyhow. There's a limit to how much dB you can cope with reproducing uncompressed 24bit music.
It rapidly approaches the SPL of the real concert venue, which of course not that many people know anything about anyhow! I don't believe for one minute, they will keel over in that sort of way. These Bogen amps were designed for flat out abuse for decades and thrashed constantly. They also sound pretty good! Yes well if you look it up you will find the power is V in our country.
Further:- The 2, extra would consume 3. This means the units have considerably MORE reserves of current than they would otherwise have, and are consuming a little over HALF the power they would normally be asked to do. This increased power supply stability means the voltage under full load is MORE stable not less, and of course one has to take care to run the right impedance back to the OPT from the speakers.
The use of 2 valves not 4, are leading to considerably lower THD distortion especially at lower frequencies, which as you can see have the most energy according to my calibration tests where the speakers have the lowest impedance. So how many more people are going to tell me it's about to blow up, when it's working very conservatively within its correct design operating parameters?
Very good. It resembles a good RF valve quite a bit, the 6ER It's a much better triode than any 12AX7 clone will ever be. Back to the fun and games of a new circuit iteration No1.
The primary idea being minimum parts count and remaining invisible with much lower distortion, hum etc. What is better? To get a pentode to behave more like a triode, or triode s to behave more like a pentode? The other clever bit is to buy a tiny input pentode off the shelf, as the local electronics shop has more than 50 in stock.
Last edited by mullered; 20th April at PM. BB code is On. Smilies are On. Forum Rules. All times are GMT. The time now is AM. Resources saved on this page: MySQL Bogen beasts again. User Name. Stay logged in? Mark Forums Read. Please consider donating to help us continue to serve you. Page 2 of 6. Last ». Thread Tools. View Public Profile. Find More Posts by mullered.
We're looking for this after all:- "With an anode load of Ohms this valve delivers its modest 2. This in the s was the standard output for low cost audio products". If used in push pull an output of 4 Watts is possible, but this valve was not expected to be used for hi fi. Well here's the line up:- ECL80 So that's a 6V6 clone in there! These valves must have been the ones large numbers of people heard Lord Haw haw on.
Bet those side contacts were fun for push pull! Those gold mettalic paints And back to this:- Hope you enjoyed the trip around Baker street. There's nuthin new under the sun, least of all in a 60s Telly. For the "budget" radio end in the UK, it was simply recycling and regurgitating the same old stuff for 50yrs, a bit like their motor industry. So I am about to regurgitate it from Europe and pop it in a yankee amp with some tweeks to make it into "hi end" audio work!
What a laff! How is that stable? They all cost about 40cents here, or about 35p! They even crammed nuvistor versions of the thing into the MIG29! Posting Rules. Similar Threads.
Nov - American Radio History
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The KW 160 Transmitter Chris G4AKE
For some time I have been keen to develop a single ended guitar amp design. All of my Lamington amps use two output valves in push-pull which is a more efficient way to operate an output stage. However there is some thought that a single output valve although inefficient produces a unique sound and I was keen to try a suitable design. It is my first ever single ended design to be developed, as all of my previous Lamington designs are push-pull. It is difficult to describe the tone produced by this amplifier, but it parallels my experience with a single ended hi-fi amp built numbers of years ago — it just sounds more musical for want of a better word. First, here is an image of the final amp:. Some background on the design: While a single-ended i. The first hurdle was in finding a suitable output transformer.
6V6 Explained
The Gear Page. Sep 6, 1. Messages: Trying to learn about the differences in these tube amp types, especially when it comes to selecting pedals, specifically OD, delay and reverb pedals. Sep 6, 2. Messages: 11, You can't say much about the sound when you only talk about the tubes.
Engineering:6V6
Fortunately Mr Millett has done a lot of the hard work for us It really does date from more than a decade ago:- Audio Asylum Thread Printer This guy adds a bit of convincing explanation:- The Solid State Tube here too:- Valve Technology Triode strapped pentode low distortion split load invertors concertina therefore produce extremely low distortion,- mostly 2nd harmonic and this will cancel out in the final stage also. Indications are a likely distortion level below 0. Why did they sound so awful, with masses of hum and distortion? They must have been designed on a beer mat.
TUBE AUDIO AMPLIFIERS - Amplificadores y pre-amplific.
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Well, what are they good for? Keeping you warm on a cold night. Letting you know that the fuse hasn't blown. Just imagine how much less air we would have to breathe if there weren't any valves around. Being born in the forties, a kid in the fifties, and a teenager in the early sixties, I grew up with valves. Our main radio, called a wireless set in those days, was a 5 valve TRF.
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