A friend of mine wanted a small Guitar amp. A small box with a 4" element. I have some parts from an old radio that I wan't to use in order to make it as cheap as possible. The parts I have is based on one EL95 Tube.
Any suggestion?
EWBrown wrote:If your old radio "parts donor" is one of the 50s or early 60s vintage German-made Telefunkens or Grundigs (these often used SEP EL95s), then you have most every major component you will need, including the power and output transformers. Some later models used SEP EL84s, for increased output power.
I've seen the carcasses of these radios sell for very low cost, or sometimes even for free, the original owner usually has stripped out the tubes, and then junked the remains.
A 12AX7 / ECC83 for the input stages, and EL95 output (these like to work into 11K primary OPTs, the telefunken OPTs are generally 11K:4 ohms, or 12K:4 ohms.
Should be good for 2-3 watts output in pentode mode. Which would make a nice small practice amp, with a 4 inch speaker.
Tang Band (from Taiwan) makes some nice 4 inch, 4 ohm relatively high-efficiency speakers for not too much expense. Parts Express and others sell this product line). This combination definitely won't be able to compete with a Marshall cranked all the way up to "11"... ;-)
HTH
/ed B
Do you have any suggestion on a schematic I can use. I don't know much about guitar amps.
ChrisAlbertson wrote:
The hardest part will be "voicing" the amp. Guitar amps are not at all like hifi amps. Hifi amps needs to cleaning reproduce their input but guitar amps color or even distort the sound. At the very least any guitar amp will shape the frequency response
If you want to buil;d from a known good sounding schematic then you will have to buy parts to match. If you want to use the parts on-hand then you will have to design your own schematic. or at least be wiling to do a lot of "cut and try" experiments after you get the amp to work in order to get the values of resistors and caps "right" for the tone you are looking for.
The speaker is an important part of the guitar sound. Guitar speakers are NOT "hifi". They typically don't reproduce lows below 80Hz or highs above 8KHz. You want a "real" guitar speaker not a hifi speaker if you can. The smallest will be 6" but you get better quality as they get larger.
Prometevs wrote:ChrisAlbertson wrote:
What you mean is that I can use any amplifier schematic and then start testing, changing components until I'm satisfied. Is there any guidelines I can use for this?
soundbrigade wrote:About speakers, I have an old Philips thing salvaged from an old organ. It is I guess 8" AD4000 speaker and is really vintage looking.
I slightly recall that we are both from Sweden so if you like, you can drop in and collect it.
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