Epiphone electar tube 30 amplifier schematics
I bought it during college in the late s and have had it ever since. It still works, but could probably use a tune-up or whatever they do to amps to make them sound better. What can you tell me about my amp and do you know what it is worth today? I still have all the amps and guitars that I bought during college as well—lots of memories! Epiphone began offering Hawaiian-style guitars and a line of Electar Spanish-style 6-strings in , and wanted an amplifier to pair with their new guitars.
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Epiphone pickup wiring diagram
By Dr Balalajka , September 26, in Amps. I just bought the Epiphone Century Amp, the 75th Anniversary edition that just came out. Cute amp and it sounds fine for what I do and it will most likely work for some of my gigs. It dopes however hum quite a bit. At gigs this probably isn't loud enough to be a problem, at home it's a bit of a pain though.
Trying to describe it It's doesn't come from the pick-up or the cable as it is there before anything is plugged in and does not get better or worse when you do plug in. The volume and tone knobs don't affect it to any degree.
It's not the electricity in my apartment, not the outlets since the same thing happens in the store. It's brand new and I have a warranty. They will look at it, probably send it in for service. Maybe it can't be fixed in which case I can again decide if I want it or not. Thing is, I want it but I'd prefer it didn't hum. Dr Balalajka 4 posts.
Yan M 22 posts. You've got 2 6V6 power tubes and 2 12AX7 preamp. Being its new take it back to the store and replace the 12AX7 one at a time. That should do it. Make sure you have good cables too. Swap out tubes and see if the problem goes away. It sounds like you have a bad tube based on your description. Some other common reasons an amp will hum are:. Short answer: Swap out the tubes.
If it still hums return it because you can't fix the other possible causes easily. I guess the store will try to swap tubes and if that doesn't work they'll send it away for repairs. Can I live with the hum?
I guess I could becasue the amp was bought specifically for what I consider my louder gigs, not for home use or even for recording. On stage the hum won't be very noticable, if at all actually. It does change a bit when you turn the volume and tone knobs drastically, the extreme settings have more hum, but it's a not a huge difference. The reason I asked is because one of the things that could cause hum is a problem with the filter capacitors.
If the main filters are bad the power supply ripple will reach the early, pre volume control stages, and be amplified by the high gain of these stages. This will cause a noticeable difference in the level of the hum when moving the volume control. If the bias supply assuming the amplifier uses fixed bias filter is bad then the hum will only reach the power tubes and not be affected by the volume control. Sometimes, as seems to be the case with your amp, the noise generated by the tubes in the early stages of the amplifier is referred to as hum but this noise it not due to bad caps.
Since most of the hum does change with volume, It sounds to me like the hum's coming from the cable, pedals or guitar. If the guitar is unplugged and you turn the amp up, do you still get a hum? If you do then it could be inadequate power supply filtering or the tubes need to have the bias matched. As tubes burn in and age the bias on them can vary and develop hum. When power tubes are balanced, the hum is nulled. I don't think that model is very old so my guess is its the power tube bias is you have the hum with no input.
There's also the possibility the amp just never had good shielding too. I've had many where I had to beef up the shielding where the head mounts to the cab, add grounded tube cans and stuff like that.
The Epiphone Valve JR had major issues with hum when they were first released. They used AC voltage for the tube filaments which increased the hum. They later modded the filament voltage for DC voltage which fixed the problem. May be the Century amps have a similar issue and a similar fix. The schematic does look like it uses AC for the filaments. They are good sounding tubes too but they aren't the best tubes for a combo because they can become microphonic from the vibration.
If the hum disappears when you unplug the input, then you obviously have hum coming in on the input jack and you'll have to tackle that separately. Even then with a gain pedal cranked and no notes being played you can still have allot of noise with all that gain amplifying nothing but AC radio waves sneaking into the signal path.
The hum is not related to the cable, pick-up or instrument. It is there before anything is plugged in and not really affected by an instrument being plugged in. The hum changes a little when you turn the volume up or the tone to the extreme settings but the change is not drastic. Thanks for the schematics!
One that can really drive you crazy is an interaction between the power transformer and output transformer. Sometimes replacing the OT with a better shielded one or one of different construction solves the problem. I had a vintage Magnatone that had that problem. None of the other Magnatone amp designs I owned had hum The extra reverb tube required forced the OT too be close to the PT and hum resulted.
I replaced the OT with a shielded one but couldn't move it. No room. But most of the hum went away. I use a Rocktron Super C noise reduction unit in the effects loop of my amp, so it can close like a noise gate inside the pre amp of the amp.
Works like a charm. Just set the N. The amp was returned to the store and they probably sent it back to the dealer to have it fixed or replaced. I say probably becasue they haven't really told me what happened. Their tech hasn't bveen in when I've called or visited the store and since this is not my main amp on most of the time it's not something that worries me. Hello everybody,i'm new on this forum,my name is Yan and i live in France.
Hum or buzz is a common issue with these kind of amps and single ended as well it is often due to filaments heaters 6,3V AC after opening the patient and thorough inspection,the amps looks very well built and isolated on the whole. The filaments supply is provided by a separate small tranny with apparently no center tap.
After measuring it,the power seems to be well balanced,but There is a well known easy trick for ,if not "curing" the problem,at least reducing a large amount of hum. As i said,the separate power tranny doen't seems to have a CT. Sometimes one side is enough. Some use a or ohms pot 2W with each side pins on the circuit's end ,and wiper connected to ground and then adjust the hum by ear.
Before soldering,one can try the circuit resistances or pot with two or three crocodiles so as to keep the warranty OK. Anyway it DID solve the problem on mine,hope it will help others! It would be much better to just convert the filament voltage over to DC to eliminate this problem. The Epiphone Valve Jr had this issue when it was first sold. People started modding them to DC voltage by installing a bridge rectifier to get rid of the hum.
Later Epi changed their design to eliminate the problem. Other things that can help. Using cans on your preamp tubes. Old amps like Fenders all had spring loaded cans that you'd screw over top of the preamp tubes ground hum out and the spring helped hold them in place. Installing them to the old style would require replacing the tube sockets but There is a new version that only requires a ground screw hole to be drilled.
Lastly you may want to try preamp tubes with spiral filament's to reduce hum. Yes you're right,it worth the try;no big deal:two diodes ,a cap and a resistor to drop the increased voltage to the right amount. BTW,on the century reissue, the preamp tubes are already in spring loaded cans epi did a good job As for the sovtek "spiral filament" tubes,some says they are microphonic:to be verified One last thing,here in Europe,some small tube amps used to have a hum issue due to the difference of power frequency PT designed for 60Hz where we use 50Hz,but well,now the trannies seems to handle both frequencies,the filtering is better too About this lovely sounding amp,this hum issue shouldn't be a give away,a red flag.
This is the main drawback with brand new amps warranty :no one including techs dares" tinkering"easy repairs. This amp has everything to become a sought after collector,meanwhile it can provide hours and hours of happiness.
S: The point is: wether you use AC or DC fil supply,you will have to ground reference it,otherwise it will hum. I have a couple of the Sovtek tubes. I haven't found them to be microphonic at all in a head. I can see where they can become microphonic in a combo. Just about all 12AX7's do become microphonic in combos eventually due to the constant vibration of the speaker. Tubes are cheap however and getting one to see if there is a difference can at least help to diagnose the issue.
If you change one and there is less hum, then its a clue to work with.
My very rare & only known first electric amp from 1930 by electar-Epiphone!!!
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Electar Century Amps
One of the amps we have in our archive is a Epiphone Electar. A lot of the modern day amps we have are modeled in the spirit of these old beauties. Take for example the much heralded Valve Junior. Not familiar with that one? Just wanted to say congratulations on the new blog! It looks great. That Electar is beautiful. I love the fact that it has a proper carry handle, rather than a strap.
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These radio, TV, record player, amplifier, amp and tape or cassette recorder schematics, circuit diagrams and service manuals are mostly high quality, very readable scans and will usually be Emailed within an hour or two, if I need to scan an item, or it's the middle of the night, here in the UK it is it may take a little longer! If more than one schematic is listed for a model I will generally send them all, unless too big to attach! Multi page manuals are Emailed as pdfs. Please Email or phone Thanks for looking, Mike. Check your PayPal Email is correct!
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Post by Ryan » Wed Nov 12, pm. Post by Jay » Wed Nov 12, pm. Skip to content. Quick links. The Epiphone Galaxie Make it loud here.
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Epiphone Schematics
Post Your Comments? You will first hear the neck and bridge pickups in parallel, then the. Website: Schematron. Category : Use words in a sentence. Website: Guitarelectronics. You can replace your Epiphone pickups with Gibson pickups. The colors may vary depending on the guitar you're working on.
By Dr Balalajka , September 26, in Amps. I just bought the Epiphone Century Amp, the 75th Anniversary edition that just came out. Cute amp and it sounds fine for what I do and it will most likely work for some of my gigs. It dopes however hum quite a bit.
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