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7c5 amplifier installation

Different single-ended amplifiers. A couple of low-wattage simple instrument amplifiers with all kinds of odd features. In addition, they sound awesome and tend to be surprisingly loud for their 5W rating. I've made a couple of those with unusual tubes and other funny "upgrades" and this page is dedicated to them. Les Paul Junior One day I was staring at broken radios at the local second-hand shop and noticed an ugly wreck. It was so bad it would be impossible to restore it, so it was a chance for me to use it for some project.


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Which Power Tube ?


Return to Homebrew Radios and Equipment. Users browsing this forum: Google [Bot] and 5 guests. Another amp design Ads are not permitted. Another amp design by Tube Radio » Apr Mon 06, am Just got a console that uses a single ended 7C5 for the audio output and a little 8" speaker. I want to mod the amp for push pull. Power transformer is only rated at 65mA for its HV winding. I have three options. Option 1 Ditch the 7C5, use a 7F8 for the phase splitter then build a separate chassis with either two 6V6 or two 7C5 tubes with its own power supply.

The other triode could be used as a preamp for the phono if the output of the replacement cartridge isn't high enough or I could find a single triode loctal tube if such a thing exists and use it.

Option 2 Keep the 7C5, add a HP filter and use it to drive a tweeter. Option 3 Ditch the 7C5, build a push pull 6V6 amp with 6J5 phase splitter and power supply. With those options the 7R7 will still be the driver tube. The first and second options require the most mods. Either way the chassis can be put back full stock. Which would be the best way to go about doing it?

I have tried the chassis with a One Electron UBT-2 and the bass response is much better than the stock transformer. I noticed that after removing the loudness compensation components the volume control doesn't seem to drop the treble when rotated from full CW. I also have a couple options concerning the discriminator diodes and AM detector diodes. I can replace the AM detector diodes with 1N which as I found in my Hallicrafters SW seems to increase sensitivity some which is beneficial for those radios without a tuned RF amp stage.

The discriminator diodes I could replace with 1N if that diode will work , but the only reason for doing that would be to eliminate a tube which will reduce the current on the 6. Re: Another amp design by Johnnysan » Apr Mon 06, am Option 4: leave it the way it was designed. What mods I do will be done in such a way that they can be fully reversed to original without any evidence that mods were ever done.

The whole point of this is I'm not a big fan of single ended amps. Normally I would have passed up this Silvertone console because of the single ended amp, but it was either I take it for free or it was going to be trashed.

This mod can be put back fully stock with little trouble. So having had time to play with the chassis for a few days and thinking it over I believe option 3 is my best choice. I will order some 1N diodes and once I am done recapping and replacing the resistors I will try the diodes and see if they make any difference in sensitivity on AM and see how they work for the discriminator.

If the diodes work good I will leave them in place. If they don't I will remove them and use them for something else. Re: Another amp design by 35Z5 » Apr Tue 07, pm Johnnysan wrote: Option 4: leave it the way it was designed. Tube Radio wrote: What mods I do will be done in such a way that they can be fully reversed to original without any evidence that mods were ever done. What I wonder is why there is a 47 ohm resistor between the 7C5 plate and the output transformer.

Given the 7C5 is similar if not exactly like a 6V6 provided I can find two quality loctal sockets I'll use two of those tubes to build a push pull amp. Re: Another amp design by azenithnut » Apr Tue 07, pm I've been considering doing something similar to a Zenith console 8H It has a single 6K6GT output tube.

As you are mentioning, in a way to be able to easily reverse the modifications. Re: Another amp design by Tube Radio » Apr Sat 11, pm I'm also possibly thinking of adding a bluetooth adapter so that I can connect my cellphone to the console. What I may do is wire in a Vac relay if it won't introduce hum in the audio in parallel with the phono motor so that the input can be switched to phono when the phono is turned on.

I will rectify the heater winding and add a 5 volt regulator to power the adapter. My plan is to possibly use the 7C5 socket if I can find a loctal plug which may have to come from a dud tube to hold the rectifier and regulator so that I don't have to drill any holes in the chassis which keeps with my theme of not making irreversible mods. With the 7C5 gone that will save heater current. I have read somewhere that the 7Y4 can short like a 6X5 can so I may replace it with diodes and a resistor which will save additional heater current.

EDIT: I am so surprised at how well this chassis works with all its original components. Re: Another amp design by Tube Radio » Apr Tue 14, am Ok I've nearly got the chassis totally restored and it sounds very good. Used a three ohm resistor in series with the tweeter as I needed an adjustable L-pad and the tweeter is 5 ohms impedance.

Here's my issue. I am seriously thinking of using the single ended amplifier with HP filter to drive the tweeter then the 10 watt 7C5 amp with LP filter to drive the woofer. Now the question is how do I implement the filters and also will the single ended amp have enough output to allow the tweeter to be balanced with the woofer? I also will need to add a level control after the audio driver so I can adjust the tweeter level. Or I can just use the original amp which is what I will do anyways until I get the money to build the push pull amp which will give me time to evaluate the single ended amp and make more of an informed decision.

This is one of those times where something I thought was cheap and wouldn't be very good has literally knocked my socks off. The record storage door has a grillcloth on it as well so I was maybe thinking of perhaps installing the 12" speaker on the record storage compartment door and using the original 8" speaker to make it a three way speaker.

Not sure how that would sound with the tweeter, but I can do a test by subbing the 8" for the 12" woofer. If it works good enough I'll have to figure out a crossover frequency for the woofer and I'm thinking maybe somewhere around the more commonly used Hz.


Philco TB-2 Instructions

I have collected a few schematics. Premier service books have not yet turned up so the schematics that I have are, for the most part, done by hand. I have been trying to clean them up and make them readable. Please, if you are a good draftsman and know how to draw up a circuit, I would love to add them here. Some of these schematics are big, so expect the download to take some time.

Text: 6AA-L-0 Sylvania Type 7C5 BEAM POWER AMPLIFIER GT EQUIVALENT 6V6GT gas module sensor Magnos Uras26 magnos abb caldos 27 uras 14 manual.

Tubes Asylum


Return to Homebrew Radios and Equipment. Users browsing this forum: Google [Bot] and 5 guests. Another amp design Ads are not permitted. Another amp design by Tube Radio » Apr Mon 06, am Just got a console that uses a single ended 7C5 for the audio output and a little 8" speaker. I want to mod the amp for push pull. Power transformer is only rated at 65mA for its HV winding. I have three options.

35ft HDMI 26AWG Certified CL 2 Rated for in wall Installation

7c5 amplifier installation

Questions about tubes and gear that glows. Tubes Asylum Questions about tubes and gear that glows. Best Sounding 6V6 About 20 years ago I rolled perhaps 20 different 6V6s to find the best sounding in triode connected. The best was an early Sylvania 7C5 with the oval plate and no square shoulders.

This amplifier started out with a stroll through a woodworking store in Oklahoma City, OK.

True NOS Matched Quad (4x) Sylvania USA 7C5 Smoked Glass Tubes


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From to amplifier production at Magna centered around 5 watt and 10 watt steel guitar amplifiers. A lot of the early models were finished with mother of pearl plastic that matched a Magnatone build steel guitar. The guitar and amp were often sold as a set, but they could be bough individually as well. Colors changed, but blue and black were most popular.

Order by:. Available to:. Free Shipping. Vintage Harmony Solid State Amp guitar amplifier. Hello, This is a Basic Harmony Amplifier. The amp Has Tremelo and all knobs are working great.

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The 6V6 is a beam-power tetrode vacuum tube. The lower-powered 6V6 was better suited for average home use, and became common in the audio output stages of "farmhouse" table-top radios , where power pentodes such as the 6F6 had previously been used. The 6V6 required less heater power and produced less distortion than the 6F6, while yielding higher output in both single-ended and push-pull configurations. Although the 6V6 was originally designed especially for use in automobile radios, [4] the clip-in Loctal base 7C5 , [5] from early , or the lower heater current 12V6GT , both with the identical characteristics to the 6V6, but with the smaller T-9 glass envelope, soon became the tubes of choice for many automotive radios manufacturers.




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