El34 world schematics 5th
It is based on a classic American tube-circuit design combined with a British-style Class A output tube section. At low volume it produces a clean, chimey tone that moves into smooth overdrive at higher volumes. All parts are included along with a pre-drilled steel chassis, wire, and tubes 1 EL84 and 1 12AX7. Puts out at least 5 watts. The chassis layout is open for easy assembly using the clear, easy to follow instructions.
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Tube DIY Asylum
Bookmark this page This page is full of links that lead to every information page on my web site. There is a ton of information below, take your time and read it all.
Many questions can be answered by studying the information below. Click on the Bookmark Links below to navigate around this page Hoffman Turret boards Note that Hoffman boards are not assembled by looking at my builds. This is where you go to ask tube amp questions. My Tube Amplifier and Guitar help forum Amplifier service technicians listing Tube amp Schematics and layout diagrams Everything from Acoustic to Wurlitzer PDF tube amp books that you can download Right click on the links below and then choose "Save Target as" Save the PDF files to your computer where you can find them and then read them via Adobe acrobat Note that these are very large files.
Radiotron designers handbook 3rd edition - 16 mb Radiotron designers handbook 4th edition - 25 mb Top of page Hoffman Board information Note that Hoffman boards are not assembled by looking at my builds. You assemble Hoffman boards using the documents listed under each board What is a Hoffman board? Hoffman boards are classic amp circuits that have been re-designed using my own turret lug layouts.
I didn't invent the circuits, I just came up with a slick way to organize the circuits on super neat turret lug boards. Use the Hoffman layout diagrams, parts listings and assembly instructions found on this page to assemble these boards. This board on the forum has questions and answers about the Hoffman Turret boards Do not use the old layout diagrams The really really old layout diagrams below are labeled - Layout diagram 1 The really old layouts are labeled - Layout diagram 2 The new layout diagrams below are PDF files Do not use one of my projects to assemble your board Use the PDF files below each board to assemble your boards Important info: Please refresh the PDF diagrams below The PDF diagrams on this page are being updated all the time.
You will not see the latest version until you hit refresh on your browser as you are viewing a PDF diagram Your browser will be displaying the older PDF file version unless you refresh it See this post on my amp forum about problems with internet explorer Note: When assembling the Hoffman Turret boards, use the documents under each board section.
Do not use my picture builds to assemble a Hoffman board. You may look at my picture builds as a rough reference only. Things always change after I do a build. That's why I do the test builds first. Check out these pages Hoffman Board manufacturing instructions - Page 0 Hoffman Board manufacturing instructions - Page 1 Hoffman Board manufacturing instructions - Page 2 Hoffman Board manufacturing instructions - Page 3 Hoffman Board manufacturing instructions - Page 4 Hoffman Board manufacturing instructions - Page 5 Hoffman Board manufacturing instructions - Page 6 Old Hoffman Board kit info page Top of page Mods and Projects 1 These mods and projects are not supported with any sort of tech support by me personally.
Some are projects that I have built for me personally or I built them to document a build process. In some cases you need to have major fabrication skills to build these projects. Please go to the Hoffman amp forum for technical questions. If you take a stock Marshall 18 Watt circuit and add in another pre amp gain stage, you get a terrible monster amp that can go from clean to mean.
I added a second gain stage to the stock 18 watt circuit and call my version the 18 watt Stout. I also came up with a way to wedge reverb into to the Stout, which is called the 18 watt Reverb Stout. El34 Push Pull Stereo Amplifier. I built this one for myself.
Fixed bias, high voltage turn on delay and regulated DC for the pre-amp tube filaments. Here is the amplifier schematic. You can use your favorite schematic, customize an existing circuit as I often do, or design your own. Power Supply. I love off the shelf parts an PC boards when building. The power supply is a Glassware Audio PS-3 board with a few component changes. A Rubli high voltage delay board turns on the HV after the filaments warm up. I wasn't worried about so called cathode stripping as I don't buy into that idea on a amplifier in this wattage range.
I have read that it is an issue on high powered transmitters and such. I had got the Rubli board to experiment with to see for myself, so I installed it. This amp can have over v available until the tubes start conducting. It just makes sense that it will put less stress on the tubes on warm up. But the choice is yours when building. Someone had asked me since you don't buy into the idea of cathode stripping, why the high voltage delay board?
Consider bias voltage. In a fixed bias amplifier with a high voltage delay, you can be sure that proper bias voltage is up before HV is applied to the tubes. Here is a scope shot taken a t hz just before clipping into an 8 ohm load. But that output is not entirely true as it was only one channel driven. I need to get another dummy load. The chassis is a standard Hammond aluminum chassis. After gathering your components you can layout the chassis by leaving the protective peel off plastic on.
I use a fine tip permanent marker to layout the holes. You can mark your holes for drilling with a spring loaded center punch. I make the larger holes with a vintage radio punch set which does a nice job on the transformer wiring holes and tube socket holes. I like using PC boards. You also can purchase one of the pre-made boards as those such Pete Millett or others. Bottom of the board. You can see the Mallory p coupling caps, I like them, how they sound.
Jim Marshall started building amps in He did this together with technical friend Ken Bran. Their first amps were very heavily "inspired" on the Fender Tweed 4x10" Bassman.
Little did they know then that they were at the threshold of a rock 'n roll revolution Although this division is not entirely accurate, it does give a good impression of the different era's.
The first decade in the history of Marshall is regarded by some as the "Golden Years". In the following overview, I try to place the amps in some kind of chronological ordering. Keep in mind that allthough I try to be complete, this is obviously not a complete list, though I hope it will be some day The very first prototype Marshall amps were built in in Jim's kitchen.
In these early years the amps, their features and especially the cosmetics varied a lot. This was the very first Marshall amp. It was built from up to It didn't actually have a model number at first, but later it was called a JTM It is said that the first prototype and early production amps were fitted with two beam power tetrodes, three ECC83's and a GZ34 rectifier tube, but soon KT66 tubes were used instead of the 's.
These amps had 2 channels with each a volume control and two inputs making a total of four inputs. There was also a power switch and a standby switch with a power indicator. The first JTM45 amps had no model number printed on them. These first speaker cabinets didn't have a model number at first. In these cabinets were given the model number They were angled front cabinets and were fitted with four 12" Celestion G speakers, instead of the four 10" Jensen speakers in an open cabinet like Fender did.
Late or early the ceramic speakers were replacing the alnico's. Single-ended SE power output stages are probably the simplest form of power amplifier. They are usually used for relatively small amplifiers, e. Higher powers are obtainable with either very large power valves, or by using multiple valves in parallel, but beyond about 15W it is usual to use the more efficient push-pull system. The sound produced by a single-ended amp is rather unique. SE can only operate cleanly in Class A, and whereas a push-pull output stage tends to cancel out even harmonic distortion, a single ended one won't.
Since for power amplification it is usual to use pentodes or beam-tetrodes, which produce predominantly odd harmonics, we can expect all possible harmonics and a particularly rich sound from a SE amp. Initial Criteria: The principle of operation for the cathode-biased single-ended output stage is somewhat simpler to understand than that of the push-pull amplifier, as a SE stage is similar to a typical pentode stage used in preamplifiers.
Its only real difference is in using a transformer for an anode load, rather than the resistor that you'd see in a preamplifier stage. The first two things to consider when beginning to design are: What sound are you looking to get from the power amp, and how much output power do you want?
These are important questions because they will dictate the choice of output valve - which itself will dictate the design of the rest of the output stage and power supply. If you already have an idea of the HT voltage and current available then this will also influence your choice. For illustration purposes we will say we've decided we need about 10W which is enough for gigging at moderate to high distortion levels! The output power from a SE pentode stage will be roughly half the anode dissipation of the valve, so we'll need a valve capable of 20W or more.
We can disregard 'big bottle' valves such as theKT66, KT88 and KT90, as they will easily deliver more power than we want or rather, consume more power than we might have available! Your choice may also depend on the availability of valve types where you live. In Britain the power pentodes are generally cheaper and more widely available than the beam-tetrodes, which are more common in the US.
If we decide that we would like the stage to contribute an aggressive character to the sound of the amplifier as a whole then the EL34 is a good choice, and should deliver around 8W to 11W at a reasonably low HT of V and somewhat more at higher voltages. Transformer Impedance: When selecting a transformer it is necessary to know what HT voltage is going to be used at least roughly.
Referring to the data sheet, we can see that an EL34 can be operated from a very wide range of HT potentials. Other single ended EL34 designs commonly use between V and V. The lower end of the range will suit lower transformer impedances, and vice versa. In the following example we'll use V. Incidentally, although the El34 data sheet claims the maximum quiescent anode voltage is V, this applied to current production in the 's.
Modern EL34's have questionable reliability at such high voltages, so it would be wise to restrict ourselves to an HT of less than V. Transformer manufacturers generally state that an output transformer will show 'x' primary impedance with 'y' secondary load. For example: 5k primary impedance with an 8 ohms secondary speaker.
This is derived from the voltage and current ratio of the transformer, which are inversely proportional to each other. It's easy to see that a transformer that exhibits a voltage and current ratio of 20 will have an impedance ratio of This means that connecting a speaker of 8 ohms to the secondary will reflect an impedance of 3. Doubling the speaker impedance to 16 ohms would also double the primary to 6. This is a useful trick that may allow you to obtain your ideal primary impedance by connecting the transformer to a speaker impedance other than the rated value.
El84 tube data pdf file
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Help: Marshall 2203 5-Pin Power Switch
A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the s and s. Valve amplifiers can be used for applications such as guitar amplifiers , satellite transponders such as DirecTV and GPS , high quality stereo amplifiers, military applications such as radar and very high power radio and UHF television transmitters. Until the invention of the transistor in , most practical high-frequency electronic amplifiers were made using thermionic valves. The diode conducted electricity in one direction only and was used as a radio detector and a rectifier. In Lee De Forest added a third electrode and invented the first electronic amplifying device, the triode , which he named the Audion. This additional control grid modulates the current that flows between cathode and anode. The relationship between current flow and plate and grid voltage is often represented as a series of "characteristic curves" on a diagram. Depending on the other components in the circuit this modulated current flow can be used to provide current or voltage gain. The first application of valve amplification was in the regeneration of long distance telephony signals.
Welcome To the Hoffman Amplifiers Forum
Hey Roly, I was wondering if you knew of anyone or anywhere i could get the schematic diagram for my amp. If they don't match, there could be consequences: If the speaker impedance is higher than the amp's, the amp might sound weak or dull. This signal is then amplified by the IF amplifier. If moisture is present, replace the defective amp relay module. The list of available models is divided up by families.
Library: 1a4250 Manual: For Mobile
There are hundreds of pages of Tube amp information on my library page. Screw the batten into the MDF. Laney VC15 - In need of sharper and clearer pdf copy. As far as I can tell, this is a clone or perhaps rebranded of the Laney Cub 8. Preferred Seller. Leave this field blank.
Vht Special 6 Combo Manual Treadmill
Moderators: pompeiisneaks , Colossal. Post by Mike52 » Wed Feb 28, am. Post by pompeiisneaks » Wed Feb 28, am. Post by pompeiisneaks » Wed Feb 28, pm. Post by joeboo88 » Wed Feb 28, pm. Post by Mike52 » Thu Mar 01, am. Post by M Fowler » Thu Mar 01, pm.
Discussion in ' The Workbench ' started by rmroza , Feb 26, Log in or Sign up. Marshall Amp Forum. Ok, so this JMP had a 5 pin lighted power switch like the following.
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Bookmark this page This page is full of links that lead to every information page on my web site. There is a ton of information below, take your time and read it all. Many questions can be answered by studying the information below.
Lovely topic