r/diytubes

i have this exact one at home. i want to convert it into an microphone preamp that goes into the insert point of my mixing console. is it a realistic goal? Thanks!!

First time building something with turret boards. Just wanted to make sure I'm not doing something stupid.

Don't worry about the wires looking too thin. They are double insulated with kapton and ptfe so are good to over 600V.

Orange-style amp with a preamp 12AX7, PI 12AT7, two EL84’s and an OPT for a Laney. Makes around 15W. Used a bunch of cheapo parts and a bunch of old russian/czechoslovakian parts. Plan to add a real nice faceplate, a pretty Fender style grille and some nice knobs. Has a real nice british-mid bite.

Found this in a box in the garage don’t remember where I got it.

Finally built this prototype after thinking about it for ages.

Schematic is on my computer and I'm posting this from my phone so can't post it just now.

Its just a basic 12AX7 LTP phase splitter and a GU-17 as the power tube.

Now that I've got the prototype working I've ordered some turret boards and such to build it proper and build 2 of them so ive got stereo.

The power supply is kinda janky. The comverter I'm using for 250v likes to be noisy and I had to filter it more than I had liked.

It was fun finally building this thing. Next I'm going to see how well it works when I add some feedback.

I just picked up this Dukane 1A385 that’s been pretty heavily modified and includes components i haven’t come across before… in particular the large metal casings to the left of the output transformer.

It appears to have been worked on by a company called Signal Equipment Co. out of Seattle at some point and from what I can tell from just a brief look is that a step up transformer (Dukane 3A65) has been added in place of one preamp tube, theres also a relay and these two metal cans marked REP 94 E (the biggest) and RET 307 P (the smaller of the two) that were later modifications.

Anyone have any idea what these components are or any guesses on what this amp was modified to do?

I'm new to the world of tubery. Am looking to replace the stock JAN5654 tubes in my Douk Ampapa A1 phono preamp. Can someone give me suggestions for a good, worthwhile upgrade? One person mentioned the Mullard 6AK5W CV4010 M8100 EF95 5654. Any US resellers of the Mullards, which appear to be made in UK? Thanks for any suggestions with online sellers and links. https://doukaudio.com/products/ampapa-a1-mini-5654-vacuum-tube-preamp-phono-turntable-amplifier-w-tone-control

I've got a Super Sonic 22 combo that's got some issues that I hope you can help me suss out. It makes some pretty bad crackling/farty distortion sound as soon as it gets above a certain, not very loud, level. The reverb knob causes the overall volume to drop as you turn the reverb knob up. When the reverb knob bottoms out, the amp starts squealing. Tapping on any of the knobs causes a scratching sound, as does tapping on the power tubes.

I tried using Gemini to help me debug this, but it's sprinkled enough obviously erroneous info in the chat that I don't trust it. Regardless, some things it directed me to try were:

Patching the Effect Send directly to the Effect Return (didn't change anything)

Swapping the positions of the power tubes (didn't change anything)

Reseating all the tubes (didn't change anything)

I don't have a separate set of power tubes to swap in, so I haven't tried new ones.

Any ideas on what could be the issue? Faulty tube socket maybe?

I got this amp couple months ago in a lot of other gear, and it's been like this as long as I've owned it, so I can't speak to how/when the problem may have started.

I'm new to Tubes and bought a lot that had these hidden within it. The Siemens from what I can find seems to be scarce but the other also says z2b....what is the difference? What makes the Siemens "rare" if it is?