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If the hum is going in and out with volume settings it may not be the volume pot. It could be hum picked up in the preamp section is canceling out hum in the power stage at certain settings. You can...

Went to the Fender site and did not see the schematic for the Pro Jr posted. So figure it would be similar to the Blues Jr. and by the look of it all amps have the input grounded without a cable...

Made a mistake the VHT Special 6 is a 6V6 with a turret board so similar to the kit but already built. http://www.vhtamp.com/avsp16h.html You can’t beat a manufactures ability to buy parts in volume...

Looks like a lot of money to me. Figure it is the same basic amp as an Epi VJ, Kustom Defender, or a VHT Special 6 except a 6V6 instead of a EL84. All those amps do not use a rectifier tube but an SE...

Not sure what you are thinking about with multiple rectifier, filter circuits and regulators. Are you just trying to split up the load across more then one regulator? If it is to just split up the...

Well if you have a load as high as 1 amp and your raw supply into the 7809 is approx 23 volts as calculated above that is (power + current X voltage) (23 – 9) X 1 for 14 watts. With a say 26C/watt...

If that is a TO220 package as I stated above you will have approx 14 watts across it without a heat sink you can only do approx 2 watts by the data sheet (65C/W). With a heat sink the TO220 package...

You will have way more raw voltage (rectified voltage before the regulator) then you need with 18 VAC. 18 VAC will be 25.2 volts peak (1.414 X 18) loose 0.7 for each diode in the rectifier so if you...

The mid frequencies being out of phase from the high and low frequencies would have no real effect on your ability to overdrive the input tube stage of the amp, you need more gain and headroom for...

Just a thought on that active tone control circuit. You are changing the phase of the input signal by quite a bit. Any tone control circuit that is for the most part made up of resistors and...

Just for what it is worth I think it would be better to build the active tone control as a pedal and go all tube on the Crate V5. If you got the V5 to have a tube amp I think you should go all tube...

That pedal board op amp circuit will work fine with up to a 36 volt supply. You could run I off the same supplies in the V5 if you returned the -Vee pins to the -18 volt supply and replaced the...

For what it is worth the PCB board looks scorched but maybe still OK although some solder joints look cold. You can do a point to point with an ohmmeter and voltmeter checks on the tube socket to see...

A big problem for headroom in the V8 is the power supply for the op amp is only +/- 8volts so you can have clipping with low gain on the op amp. The V5 has +/-15 volt rails and you could up them to...

On getting a Bugera schematic Bugera is Behringer and they do not send out schematics. The Bugera does have solid state reverb I traced out the amp and posted a schematic over at Sewatt once upon a...

I was just posting the specifications of the tubes in the Dynaco amp so you could see the similarity and differences between them and a 6550. I don’t see any reason you could not go with using the...

Relative to which transformer would be better I can’t say. I haven’t used either one and the specifications don’t give enough detail to say one way or the other. If you go by the heaver the...

In looking I have found these two output transformers http://www.triodeelectronics.com/a451.html this one for a Dynaco audio amp so the low frequency response should be good. Here is the manual for...

What are you trying to do by changing over to 6550 over EL34/6L6 as the output tubes? You cannot make a 200 watt head out of a 100 watt head if that is what you are thinking. The output transformer...

The Weber AlNiCo will fit without the shielding around the magnet. You could consider the Eminence Legend 10516 as a speaker choice also. The output transformer impedance is really 16 ohms so you may...

Here is a list of things to check and ohmmeter to see if the connections are correct.


With the op amp out you should have C24 C25 and C26 removed with a jumper from pin 3 of the op amp to the...

If you do the mod at post #160 the stock volume pot will be a volume pot again and the tone pot will be a tone pot again with C6 installed. So you won’t have the volume pot acting as a gain control...

Yes just put the resistor across the two outside lugs of the pot to parallel it. I looked at the schematic and originally the signal to the second tube was across a 10k resistor so with adding the...

I wish the schematic mark ups were still on line, oh well. I should remember the mod, but it has been awhile. I don’t recall if the tone pot is a linear or audio (log) taper but there is way more...

If the sound you are looking for was done in the past with a stand alone reverb like the Fender 6G15 http://www.kbapps.com/audio/schematics/tubeamps/fender/reverb6g15.html the reverb in the amp will...