Tube Amp Archive

thanks for reply.

one more question...
are there any differences whether rolloff cap is placed on V1a or V1b?

hi there though i'm not good at electonic things or tube stuffs luckily i was able to finish some projects now i'm planning to build laney GH50L clone (i always like IA and paul gilbert tone) while analyzing schem., i found small cap between 1st stage plate and cathode. it doesn't seem normal cap li...

i checked grid resistance and there's no open (can read specific resistances.) also it's not a speaker problem (works well with another amp) more specifically my amp sounds like a "tremolo" sound appears and disappears repeatedly. it is likely that there's some destructive and constructive interfere...

thank you all.

m fowler > yes, what you asked is the problem i have. please help me~

alexo > i'll check my grid resistance like you said.
do you have any suggestion or way to check
if i have ultrasonic oscillation-like problem?

hi guys i need some help. i've just finished my 2nd job, tiny terror clone. i started up with bulb limitter, checked lead dress and some voltage values like... 1) heater filament : ~6V AC for 12ax7, el84 2) plate voltage : ~250V DC for 12ax7, ~300V DC el84 fortunately, it has no special hum or hiss....

thanks everyone
i'll swap wires and try another speaker..

thanks structo~ actually i don't understand what you mean, "phase" (i'm not good at making amps, this is my 1st build...) primaries of my output trans consists of 3 wires, 6.6k * 2 + 1 B+ each 6.6k wire is connected to pin3 of two EL34s do you mean that... 1) disconnect NFB 2) switch 6.6k wires conn...

after tons of trouble finally finally i did my express build but one more problem I have... first i don't have any speaker cabinet so i decided to use one in my combo amp (cut original wiring and attach 1/4 jack to speaker) it works with the speaker in my tiny, cheap amp(maybe 4inch?, don't know imp...

thank you all...
i'll try the new socket.

i've finally finished express DIY. anyway it does work but some problems I have 1. B+ ok when tube uninstalled (~405V for B+1~B+5) 2. when all tube installed, HV isn't high enough volume's so low and distorted sound even when set for clean operation(vol 1~2) 3. so i checked tube by tube(actually i d...