50l6 se amplifiers
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DIY Audio Projects Forum
Return to Homebrew Radios and Equipment. Users browsing this forum: Google [Bot] , hwhall and 7 guests. Amplifiers using non-standard output tubes Ads are not permitted. Re: Amplifiers using non-standard output tubes by Audioman » Jul Sat 16, am you can get a couple of watts out without an opt too. Re: Amplifiers using non-standard output tubes by westcoastjohn » Jul Fri 29, am Hey, I just stumbled upon this thread and it meets my criterion in a way. I have built amps around the 50L6 and find I like that tube a lot.
I think by swapping in 2 6 volt tubes, duo triodes, maybe 6AV6? The schematic shows a stereo switch but can't see a stereo circuit in there, just a aux speaker. Watch the doughnut, not the hole. Burl Ives, RIP, oldtimer. Re: Amplifiers using non-standard output tubes by 35Z5 » Jul Fri 29, am westcoastjohn wrote: Hey, I just stumbled upon this thread and it meets my criterion in a way.
Re: Amplifiers using non-standard output tubes by westcoastjohn » Jul Fri 29, am 35Z5 wrote: westcoastjohn wrote: Hey, I just stumbled upon this thread and it meets my criterion in a way.
A 6AV6 has ma heater. Re: Amplifiers using non-standard output tubes by 35Z5 » Jul Fri 29, pm If anything because it's smaller a 50C5 will run hotter than a 50L6, they are dissipating same amount of heat A 12AX7 is two 12AV6 in same envelope Re: Amplifiers using non-standard output tubes by Tube Radio » Jul Fri 29, pm Also if I remember correctly the 50C5 will have less power output than the 50L6.
Westcoastjohn, use a Triad NX isolation transformer. Far as speakers go, you want the most efficient speaker you can find given the low output wattage if you want decently good volume. I'd suggest field coil speakers of at least 10", but you then would have to build a power supply for the field coils. Your best bet is a vintage 10" or larger alnico speaker for each channel. If you intend on this being HI-FI then a pair of efficient tweeters will be needed.
If you just have to go single ended that is ok, but my recommendation is push pull for two reasons. More power output. Less distortion. The 50L6 amp I posted can be adapted for the 50C5 as is I believe. Another thing you can do if you have multiple 50C5 tubes is do two in parallel for each channel then use a 12AX7 wired for 6. Now with your current output transformers you might be able to do that by using two speakers in parallel per channel.
If the transformers originally were for 4 ohm speakers just use two in parallel and that will halve the primary impedance. May affect the frequency response though, but I am not sure by how much.
Re: Amplifiers using non-standard output tubes by westcoastjohn » Jul Fri 29, pm That's interesting. I take it you mean push-pull with 2 single end OT's for each channel.
You are both right about the lower power output of the 50C5, something I hadn't noticed before. Re: Amplifiers using non-standard output tubes by Tube Radio » Jul Fri 29, pm You could use two single ended output transformers per channel, but that is not recommended. For a push pull pair of 50C5 tubes you should use the P-T transformer as it is push pull and will work quite nicely with those tubes. That output transformer does roll off the bass a bit, but given the lower power output of these tubes more volume can be obtained if the amp's coupling caps are selected to start rolling off the bass around 50Hz as there's no point in the amp being able to pass signals down to 20Hz when the output transformer cannot do the same.
That 50L6 amp I built a 35L6 version for my Hallicrafters Sw and with an external 12" speaker it sounds a lot like a console radio. What exactly do you want out of the amp? If you don't require the amp to be HI-FI then the transformer I listed if you desire push pull will work or those two transformers you posted about if you prefer single ended.
The 50L6 can dissipate more heat. More current can be safely carried by the 50L6. Re: Amplifiers using non-standard output tubes by westcoastjohn » Jul Sat 30, am Tube Radio wrote: What exactly do you want out of the amp?
If it is HI-FI Building push pull isn't all that hard and fidelity is much better. Those small tubes can get the frequency response just not the power needed for many speakers to give good volume as they are inefficient. A pair of 6aq5's can make almost 10 watts not driven to an inch of their lives and 6bq5's about 12 to 15 watts and so on. Re: Amplifiers using non-standard output tubes by Norm Leal » Jul Sat 30, am For more power you will need a larger output transformer.
Use Horizontal Output tubes for higher power. Re: Amplifiers using non-standard output tubes by westcoastjohn » Jul Sat 30, pm Thanks, and I appreciate the input as we muddle along with this idea. Much safer than diving in. I agree with push-pull output, but am lacking the OT's for a stereo amp. As I go shopping for same, am wondering why not just buy a late 50's or younger stereo amp?
It will be cheaper than the discrete parts. What I do have is a box of broken plastic radios. With 4 single end OT's, I could try to build a stereo amp with 4 50C5 power tubes that runs on line voltage. But will it be any good? You could use your single ended output transformer in push pull. Use a totem pole output stage. I think it was zenith who a a stereo amp in that configuration with stacked pentodes from one power supply and the output tubes were 9 pin types with 50 volt heaters.
Re: Amplifiers using non-standard output tubes by westcoastjohn » Jul Sat 30, pm Audioman wrote: Hi. Here is an interesting specimen pair of tubes.
Re: Amplifiers using non-standard output tubes by Audioman » Jul Sun 31, am Also the 6gc5 is a lower powered sort of cousin but a different basing. Re: Amplifiers using non-standard output tubes by Flipperhome » Jul Sun 31, am westcoastjohn wrote: Thanks, and I appreciate the input as we muddle along with this idea.
List of vacuum tubes
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The Amp Garage
The Audio Voice Newsletter. Show more 9. Show less. Mini Single-Ended Amp September 20 , This article was originally published in audioXpress, April One day while trying to think of a new project to build, I remembered reading an audioXpress letter a while back from a reader who had requested an article about a small single—ended class A amplifier that used parts available from Radio Shack or other local electronics stores. I have always been a fan of SE amps — and of odd tube types — so I decided to see what I could find on the shelves in my hobby room that might fill such a request.
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50L6 amp designs
This is a list of vacuum tubes or thermionic valves , and low-pressure gas-filled tubes , or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. Many industrial, military or otherwise professional tubes were also produced. Only a few types are still used today, mainly in high-power, high-frequency applications. Receiving tubes have heaters or filaments intended for direct battery operation, parallel operation off a dedicated winding on a supply transformer, or series string operation on transformer-less sets. High-power RF power tubes are directly heated; the heater voltage must be much smaller than the signal voltage on the grid and is therefore in the
Category: El84 guitar tube amp schematic
Hey guys, I'm new to the forum, but I've learned alot from reading on here. I've done some electronic projects including many guitar pedals, I know schematics and circuits well enough, I'm no stranger to DIY. I've built 2 tube amps from scratch so I have moderate amount of tube experience, quite good soldering skills and I know what not to do. I'm looking to built a new AA5 based guitar amp and want to use as much parts as I can from my junk box. My first idea was to built a 50L6 PP amp, one 12ax7 at the preamp, but instead using a SS rectifier at the power supply. But I think the 60VA transformer has not enough juice to power all the filaments Okay now is this the correct way to 'guestimate' the things? Am I correct saying this design uses an half wave rectifier circuit kinda doubler..
Mini Single-Ended Amp
Here's the standard disclaimer: This is dangerous, high voltage stuff. OK, it's not "High Voltage," technically, but it's high enough to kill you. The power supply in this projects kicks out V, which is plenty, with startup spikes near V or more Don't believe it when they say "it's not the voltage, it's the amperage that kills you"--because it's both.
The Audio Voice Newsletter. Show more Show less. As Rick Spencer writes in its introduction, "In order for this beloved hobby of ours to thrive and survive well into the future, we must always strive to make it interesting to newcomers. This article was originally published in audioXpress, October In order for this beloved hobby of ours to thrive and survive well into the future, we must always strive to make it interesting to newcomers.
Return to Homebrew Radios and Equipment. Users browsing this forum: Google [Bot] , hwhall and 7 guests. The 25L6 and 12L6 are the same as the 50L6 except heater voltage. The main thing is finding a power transformer that will put out Vac will give a calculated I cannot yet find any data on using the tubes in push pull so will the mA rating of the HV winding be enough?
Here's the standard disclaimer: This is dangerous, high voltage stuff. OK, it's not "High Voltage," technically, but it's high enough to kill you. The power supply in this projects kicks out V, which is plenty, with startup spikes near V or more
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