12bh7 output transformer

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Log in. Forgot password or user name? Ebay Classic organs. AO Preamp Output transformer no good. This topic is closed. Posts Latest Activity.

Page of 1. Filtered by:. Previous template Next. I have a C3 in which my T-3 output Transformer part no AO in the preamp gave out after 50 years. The primary has zero ohms coil is open and no volts going to pin 6 on the 12BH7 tube but the secondary is still good. I do not know if transformers can be repaired.

Im hoping to be able to order one thru a supply house like "Moeser". Does anyone have a used unit in working condition?

Tags: None. It would be shorted. I would expect the primary to have maybe ohms or so and the secondary to be much lower. The turns ratio should be about 3 or 4 to 1 as the impedance ratio is around 10 to1. Comment Post Cancel. Since this is a preamp and not a high-power location, there is little likelihood that the winding opened up by fusing or arc as can happen when running a P-P output stage into an open load.

12bh7 output transformer

Its far more likely that the bond from a primary lead-in wire to the coil wire has given up, either rotted open or has oxidized. Carefully with a cutting tool, cut open the insulative wrap where the primary side wires are bonded.

Cut it in a way that it can be re-closed once the probelm is found and fixed. If you can expose the actual bonding ends where the coil wire picks up the lead-in, check the resistance between the two coil end wires careful, they are usually very delicate and fragile; one accidental tug, and you'll be digging for the coil end for hours. If you see continuity, the transformer can be fixed, by cleaning and resoldering the coil end wires to their lead-ins. Carefully close the cut insulation wrap, and tape it up or seal it with a resin, and re-install the bell covers.

If you were careful not to nick the insulation anywhere, the transformer should work like new. I've recovered power transformers this way. Those smaller transformers don't have enough iron.VAT plus shipping costs. This item is no longer available1. I have read the data protection information. To be able to use Tube Amp Doctor Onlineshop in full range, we recommend activating Javascript in your browser.

To category TAD products. Go and see the doctor: Find all of our products here: our newest product line of high-end blackplate tubes, our famous premium selected tubes, and the equipment we manufacture like our Class A Converters, the Bias Master or the Silencer Tubes, tubes, tubes! Find everything from the field of tubes: premium selected TAD tubes, TAD blackplate tubes, our beloved tubesets for nearly every amplifier out there, more brands and accessories.

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Let''s make it Find everything for the final piece in your chain of tone - cabinets, loudspeakers housing the tone - plus Pro Audio. Our cabinets are To category Parts for Amplifiers. Get it back in shape! Here, you will find anything for repairs or DIY projects, from pots, to transformers, to chassis, reverb cans, switches, plugs To category Parts for Guitars. Pimp Your Guitar! Upgrade your guitar with Mojotone''s handwired pickups or pre-wired pickguards, high-grade capacitors for your Strat or Les Paul - or anything beyond that: pick-up switches, knobs, pots - or, for example, our Eric Clapton To category High Fidelity.

Headphone Amplifiers Brocksieper Audio. Find special audio and hifi tubes from leading brands like Psvane or KR Audio! Top design and best quality to listen and enjoy! Three-dimensionality, depth and scale, diversification. Or find top-notch products from Jupiter To category Tools and accessories.

Do it Yourself! Find needed and helpful tools to build or repair your amp: soldering stations, tools, spanners. Plus all the sensational contact cleaners from Caig Chemicals. Loved and trusted by our technicians in our shop as well! To category Merchandise. Fine feathers make fine birds! Show what you play! Description Reviews 0.

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Reviews 0. Read, write and discuss reviews Write an evaluation. Please verify your testimonial by clicking on the link sent to your email after submitting your text. Please enter these characters in the following text field. Similar products Customers also bought Customers also viewed. Similar products.Tube Guitar Amplifier is used by most many guitar player,it preferred because it produce sound that more "natural sound' in clean or distorted,it sound different compare to solid state guitar amp.

Normally this amp will contain heavy transformer and a tube glass that very fragile. But why need to make small amp because it practical to move around portable and make decent sound.

Output Transformers

Or if you are beginner and want to make small practice that not make neighbor get mad and angry this project is perfect for you. Also this amp is cute. Or you can just buy zvex amp or orange tiny terror that hybrid. Usually guitar amp contain Preamptone control, and power amp.

In preamp you can use matsumin schematic, real mactube, AX I use 12BH7 because I only have output transformer. I'm not responsible for what mistake that happen regarding following this project. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. Part List 1. Chassis this chassis actually for Nano amp 2. PCB 3. Power Transformer 0. Fuse 5.

Output Transformer : 8 k Ohm to 8 Ohm 6. Resistor 10 Capacitor Jack 12 Tube socket Tools 1. Soldering Iron 2. Solder tin. As I mention in the introduction, I combine the small amp tube amplifier that woks because I don't have all the necessary component such as Power transformer. Firefly Amplifier 2.

P1,P1 extreme from AX Preamp Matsumin valve caster 4. Mac tube Preamp Fist I solder all based on Matsumin pre-Amp and power section as in fireflyI got someone already success build this one Please watch this video first. I try to make the same as but it failed because high voltage section i made from this make some oscillation and the volume is to low.

12bh7 output transformer

Change by adding transformer as reverse direction.Whether you are into the clean, free spirited "Single Ended" tube output or high efficiency, high power, "Push-Pull" audio, we have the output transformer for you. We have been producing tube output transformers continuously for over 75 years, constantly improving and tweaking their performance. The output transformer is one of the most critical components in a audiophile amplifier.

These excellent designs have survived the years and have enjoyed a recent resurgence along with the tube industry. Many "newbies" to the industry use frequency specification data at milliwatt ranges to inflate their claims.

Vacuum Tube Output Transformer Measurements Determining Turns & Impedance Ratio & Matching To Tubes

Check carefully when comparing manufacturers specs. Our transformers are of EI laminated design, we do not offer toroidal designs due to their inability to handle tube imbalance and high manufacturing cost. More importantly, our designs are "ear tested". After a new design has passed our extensive testing, it's got to sound good too, before we put it on the market!

Single Ended Tube Output Transformers. These high quality units are designed for maximum versatility. Designed for both triode or pentode operation - Class A operation.

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The ratings shown are at full power and rated plate current. Available in watt models our series The lamination iron used is a high quality M6 grade, silicon steel, for low loss and the lowest possible distortion at bass frequencies. A factory set core cap ensures against core saturation at full ratings. All single-ended output models include multiple interleaved windings to maximize high frequency response. These windings are machine wound with high quality copper wire.

If you do not need hi-fi ratings or are restoring older equipment using single ended audio output - refer to our economical SE series optimized for single ended - universal - general purpose use.

Available in watt models. Push Pull Tube Output Transformers. These high quality units are also designed for maximum versatility. They are designed to be used with most all power output tubes available today. We have also added an epoxy potted series to our line for the ultimate in tube output transformers. Available in watt models our series.

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If you do not need hi-fi ratings or are restoring older equipment using push-pull audio output - refer to our economical series optimized for push-pull - universal - general purpose use. The reason for our sparkling high frequency performance is the use of interleaved windings between the primary and secondary.

The number of interleaved windings is optimized to the size wattage of the unit. All high fidelity output models both single ended and push-pull include multiple interleaved windings to maximize high frequency response. These windings are machine wound with high quality copper wire The multiple interleaved secondaries are wound series or parallel connecting them to match to 4, 8 or 16 ohm load impedances.Finale audio and Triode labs have had a focus on B single-ended amplifiers from day one.

With a number of good products on the market, we had to have something special right out the gate -- the FB Classic Mono Blocks was our answer.

Transformers

Many consider the B power tube to offer the very best that tube sound has to offer. Enteringour B Mono Blocks almost became a classic. Circuit wise, there is no change, as it was perfect since Day 1.

12bh7 output transformer

What is challenging is how NOT to raise its price while improving it - and I think we did it! It will have more phase shift, more roll offs, less natural, more distortions, and you name it.

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It's not easy to master the beauty it of it - circuitry wise, although it seem easy to construct, but it is hard to master. It IS expensive to unleash its potential, on the hardware side. And that is why most B amps on the market either fail in this regard or or measured far from the best, because they had to work within a specific budget.

Unfortunately, there is no way around quality with budget, at least with tube amps. So, high quality tube amps, especially triode tube amps, are supposed to be expensive. The first thing in getting it right is the output transformers, without a good quality and properly-made pair by a HiFi transformers manufacturer, the B will not sing and unleash its potential.

You can get away with other tubes, but not B. Here, a high-quality pair of Canadian madeit is specifically designed for triode tubes such as B. It is often designed for high fidelity, single-ended, Class-A, with frequency response at least 20 hz to 20 khz.

We don't just focus on the outputs, even the choke transformer we pick are of high quality made by Hammonds Canada and important to both the sound and circuitry. For the power transformer, it's even more serious - again, made in Canada with conservative designs that is reliable and able to provide seamless power deliveries - CSA certified and made with high quality specs such as passing HIPOT test of 2,V RMS, and made with Class A insulation degree C and so on.

All these transformers are not just used because they are good, it also has to do with reliability and safety that we care very much about. It draws only 2 amps, which makes the transformer work cooler. Take the advantage or your currency!Welcome, Guest. Please login or register. Home Help Search Login Register. Author Topic: uses for 12BH7A tubes? Read times. Do 12BH7A tubes have uses in a guitar amp? Got some NOS ones and the data sheets are bit hard for me to figure out. Just wondering if anyone uses or has used them.

SoundmasterG Level 3 Posts: Ampeg used them in the SVT among other things. They are sort of like a super 12AU7, so not a ton of voltage gain, but good current drive, and they sound good. Blackstar uses one as a power tube in their not so tube powered HT Call me Dan www. I tried it in V1 of my jam amp and it was microphonic so I tried it in the PI position. Very nice! It still has plenty of volume but it isn't as dirty. Sweet sounding cleans. I'd use it in the PI position anytime.

The 12BH7 is like a 12AU7, but has higher power handling capability. I'd recommend selling it to someone with a McIntosh tube amp, an SVT or a headphone amp that uses them as output tubes. In the first two cases, the 12BH7 is the only tube that'll do the job, so it seems to me it would find a better home with folks who can't sub something in its place. I say that as a guy with a pair of McIntosh MC's, which use this tube.

Build problems? Read this first. Could the tube be used in phase inverter duty, or as the amp feeding a tone circuit similar to the Fender approach? How about using the tube in a cathodyne application? Just thoughts, no experience. Sure, you could do that, and that's how they're commonly used. But for typical guitar amps, you don't make use of the 3. So it's kinda like using a sledgehammer to drive a nail.To be able to use Tube Amp Doctor Onlineshop in full range, we recommend activating Javascript in your browser.

To category TAD products. Go and see the doctor: Find all of our products here: our newest product line of high-end blackplate tubes, our famous premium selected tubes, and the equipment we manufacture like our Class A Converters, the Bias Master or the Silencer Tubes, tubes, tubes!

Find everything from the field of tubes: premium selected TAD tubes, TAD blackplate tubes, our beloved tubesets for nearly every amplifier out there, more brands and accessories.

Let''s make it Find everything for the final piece in your chain of tone - cabinets, loudspeakers housing the tone - plus Pro Audio. Our cabinets are To category Parts for Amplifiers. Get it back in shape!

Here, you will find anything for repairs or DIY projects, from pots, to transformers, to chassis, reverb cans, switches, plugs To category Parts for Guitars. Pimp Your Guitar! Upgrade your guitar with Mojotone''s handwired pickups or pre-wired pickguards, high-grade capacitors for your Strat or Les Paul - or anything beyond that: pick-up switches, knobs, pots - or, for example, our Eric Clapton To category High Fidelity. Headphone Amplifiers Brocksieper Audio.

Find special audio and hifi tubes from leading brands like Psvane or KR Audio! Top design and best quality to listen and enjoy! Three-dimensionality, depth and scale, diversification. Or find top-notch products from Jupiter To category Tools and accessories. Do it Yourself!


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