The Amp Garage

Thanks.

now its quiet. lead dressing and the board is re arranged. btw, i used 12ay7 on all three, the amp has very nice clean sound but the distortion doesn't start untill i turn volume to 80%. i guess its because 12ay7 has less gain. thank you.

Okay. So i will put my red and blk probe and trim it untill
It reads 6.5 ma on the meter and repeat the same for the other trim pot

Am i right?

Thanks

Hello, i built an ax84 4 4 0 according to the layout. it is quiet at volume 0. at volume 2 it starts loud hum. as i increase the volume slowly to full, the hum gets worse. i have tried different ac sockets. the hum is not coming from the guitar. the audio was recorded with no guitar plugged in. all ...

got the light sorted.

how much should the ma current read for biasing ? any input is appreciated.

thanks

to bias the amp. I will connect the probes to black and red.

And then turn trim pot 1 so the multimeter shows 39ma.
And turn thd trim pot 2 to get 39ma as well.

Am i right!

Thanks.

it is a 120v pilot light wired to the heater wires through two black resistors as shown in the pic. i am okay with not functioning. does a bad pilot light cause any issue!

shown with two red arrow on the picture.

Yaaay. my amp works now. Thank you guyz a bunch.... :D now two more issues: - - the pilot light stays off but the amp is making sound ? how can this be! - hum noise at volume 0. and becomes very noisy as i turn up the volume. when i turn the eq knobs the noise level/type changes at the same time. wh...

if you could tell me which color wire goes to which pole of the power switch. that will be helpful. thanks

i wired it according to the diagram colossal provided me.

finished building the amp. all tubes are installed with a 8 ohms spkr connected. when i power up the amp it blows the 1A fuse. i have checked for wiring closely; no short found. ground wires are okay. i pictured the power switch wiring and the OT wiring. any suggestions/comments!

Thanks Collosal. The sw im using has 6 poles. I used your layout and left bottom pair unused. I powered the amp up and right away the 1amp slo blo fuse went sparked. Im getting the fuse fixed tomorrow lets see....

Plz look at the attached pic of the sw im using.

Thank you.

Sorry for being so stupid. I am still learning about electronics. here is a diagram that i will use for the power switch connection. let me know.

Thank you.

Yes, I am using a 6SN7 as a power tube. I am looking at the chart and yes the tap 2 and 4 will be connected to the speaker jack positive and negative and i will swap them only if it squeals. Since i do not need other ohms setting i wont' use the impedance switch and that makes it lot easier. correct...

Hello, Im new to building amps. It has no standby switch in the layout but i have seen in the forums that most of you who built 4 4 0 has a stand by sw added. Now lets assume that i wont need the standby. I have 4 wires to connect to he power sw. Plz See attached photos. I will solder the black and ...