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Here is a photo of the test rig: BTW I am using a 6N1P tube as a driver (triodes paralleled with 22k anode load and 220 ohm cathode resistor) I starrted the tests with the 807 in cathode bias mode with a 470 ohm cathode resistor. Voltage from anode to cathode is about 390 VDC The output...

Hi Willem Here is the winding plan I generated from Dissident Audio's published information: I increased the stack marginally, since I only have 32mm and 40mm bobbins. So going with 40mm stack of EI96 laminations Next I rolled one layer of secondary on the empty bobbin to check how many...

Thanks WhoIsJob, the Exceller is done and delivered. To be honest, I have a few projects running with looming deadlines, so I have to spread my attention. Yesterday I had a look at how to do the outlay of the power supply and the output stage. Thew jig is ready to be built, and tested. More in...

I rolled a transformer as the proposed by the designer and took photos of the process: There were 6 secondary layers. To make absolutely sure they were each of the same number of windings, I checked each one separately. next I made some carton gaskets to insulate the magnetic field of the...

For those interested in building their own tube amplifier, we have an update on the popular Mars Kit2 Mk2 offering from Mars Tube Audio. For those who are new to this product, a quick description: the Mars Kit2 Mk2 is a 70 watt push-pull all-tube amplifier. The circuit is based upon the...

Hi All. You can follow this thread in the Valves/Vacuum tubes section. See you there https://www.avforums.co.za/threads/small-vacuum-tube-integrated-for-desktop-use.101453/page-2

I had to increase the HT output voltage a bit to get the HT under load to 400V DC.

Hi adie et al. I'll be posting updates here. I had a look a the power transformer specifications as on the schematic, and drew up a simulation on PSUD2. I could see on the published photo of the prototype on the Dissident Audio web site, that Yves used a 96mm core with a stack of 50mm. I...

Hi All tube lovers I am building a 20 watt Single Ended amplifier on a shoestring budget. This is the specifications I want to meet or exceed: Output power: 8W*2 (superlinear connection). Frequency response: 30Hz--38KHz. Output impedance: 4,8Ω. Total harmonic distortion: ≤ 1% (1kHz). Input...

Thanks WhoIsJOB; I have netted the order. I am building an affordable Single Ended amplifier with the above EL34 amplifier as a guide as to features. More to follow.

I have this gem from yesteryear on my work bench for restoration. First I fixed the power amplifier situated on the bottom panel. There was a loose wire to the PL84 heaters and the bias was wildly out causing red plate on the Telefunken's. After adjusting the bias, things...

Hi all solderers We have new dates for our DIY tube amplifier workshops in Paarl: Saturday 1 and 8 October 2022 Our Kit 2 Mk 2 is still available at original price shipping with russian 6P3S output tubes. Tube upgrades to EL34 and KT88 optional extra. Inquire for costing. Workshop cost...

Lowell George was such an innovative guitarist! My wife is a big fan, and I prefer the live stuff, especially watching the videos.

We offer options on custom branding for orders of 10 or more. All units are supplied from our workshop in Paarl, where we also provide technical backup and repairs. That said, the unit is well built locally, and has been field tested for endurance.

Solar Panel specifications Let me explain the power arrangement: 1. If the internal battery gets connected reverse polarity, the 10A fuse blows. 2. If the load on the DC 12V connections exceed 5A, the fuse blows to protect the pcb tracks. 3. the USB 5V can deliver 2.1A each, with a max of...

Maybe this is an option? I am marketing a small UPS/power station that supplies 12V and USB that can supply the power to my TOTOLINK I received for free when I subscribed to a fibre contract.

Great tip F_D. I usually go outside in the sun and do the beathing on the tube exercise to reveal the shades of lettering. I think the refridgerator tip is spot on.

Johan will be sorely missed. He's been most supportive and encouraging through the years. A man with strong ideas and ready to off load the maths if there is any doubt. What a mind!

Unplugged: like a breath of fresh air... thanks for the link.

A 100W bulb will limit the current to 500mA AC. That should be safe for most amplifier tests. But by all means, start with 15W and move up if the lamp glows only dimly.