Cute kitty.
My bench is a mess but I know what's in the mess...
I added an RC filter on the power of 2k -> 22µF and that cleaned up the wiggles.
Increased it as high as my scope will read with my 10X probe.
I want a real scope LOL
My bench is a mess but I know what's in the mess...
I added an RC filter on the power of 2k -> 22µF and that cleaned up the wiggles.
Increased it as high as my scope will read with my 10X probe.
I want a real scope LOL
I really like my Owon hand held scope. It is battery powered which means it is floating and not connected to mains earth ground. Let’s me probe bridged amps directly at the output. About same price as a good Fluke DMM.
This is a USB Hantek 6022B on a 10 year old laptop so I can get the same battery powered ability 🙂 If I want to try and watch the scope with music from the same laptop, I use my isolation xfmr board based on Triad TY-250P with a 1k5 and 1000pF Zobel on the secondary to make 10kHz square look good 😛
For under 20$ you get performance much better than the price would indicate 🙂
They are also gapped. You can pass 4mA in the primary.
For under 20$ you get performance much better than the price would indicate 🙂
They are also gapped. You can pass 4mA in the primary.
Last edited:
This is the slow ramp circuit based on Juma’s Easy Peasy Cap Mx. I’m using a 2200uF cap and 20k resistor for a slow RC time constant.
I built these scaled down FH minis in foam core a long time ago. Before the FH mini was released, by scaling the FH3 by the size of the driver. They look great and sound great.
https://www.diyaudio.com/community/threads/fh3-inspired-foam-core-mini-build.227460/
I’ll have to dig these out of storage.
https://www.diyaudio.com/community/threads/fh3-inspired-foam-core-mini-build.227460/
I’ll have to dig these out of storage.
On the bench is the RPM V12 and I am measuring the DC setpoints of the tubes in the circuit.
The upside down tubes are all glowing nicely.
The upside down tubes are all glowing nicely.
All 12 tubes glowing now.
Manually trimming the resistors of the CRCRCRC to get the correct B+ voltages took some work but it’s quite good now. I now have 373v (370v nominal) / 316v (315v nominal) / 249v (245v nominal) / 141v (140v nominal). I think it’s close enough.
Manually trimming the resistors of the CRCRCRC to get the correct B+ voltages took some work but it’s quite good now. I now have 373v (370v nominal) / 316v (315v nominal) / 249v (245v nominal) / 141v (140v nominal). I think it’s close enough.
On Keantoken’s bench last night is the Bob Carver Reference Amplifier Model 285 (RAM 285) under development. It’s fired up and making some powerful 60Vpp sine waves into a 4ohm dummy load. Now that’s what I call a BENCH.
Some apple picking this weekend. Fruit for the bench tonight. 🙂
Apples as far as the eye can see. All dwarf trees so no ladders needed.
These are Strayman variety. We also got some red delicious and Fuji’s.
Apples as far as the eye can see. All dwarf trees so no ladders needed.
These are Strayman variety. We also got some red delicious and Fuji’s.
In case anyone is looking for nicely crafted 0.53x mini Karlsonators, Jhofland has several for sale in the swap meet forum.
https://www.diyaudio.com/community/threads/for-sale-karlsonator-53-enclosures.391161/
https://www.diyaudio.com/community/threads/for-sale-karlsonator-53-enclosures.391161/
This week I've got yet ANOTHER Thorens TD124 on the bench.
A few weeks ago I did one for my neighbor, he seemed quite pleased.... that he brought me another one.
A few weeks ago I did one for my neighbor, he seemed quite pleased.... that he brought me another one.
On the bench is making a new temporary mount for an OEM AMT tweeter for a new speaker - the LSA Signature 60. An AMT variant of the Signature 50. 3D print fits perfectly.
Next comes measurements of the raw driver responses in the baffle.
Next comes measurements of the raw driver responses in the baffle.
Attachments
Those are nice TT’s. They are fetching pretty high prices on used market even.
Indeed, so I've heard.
Both TD124's, the last one and this current benched one have the Grado wooden arm installed.
And those wooden arms are going for $200-$800 insane prices too.
On the bench is a HyperDrive-2 headphone amp with a thermal issue on the 90v DCDC converter. I am using a FLIR One IR camera to see if the temps are anomalous vs a known working unit. These IR cameras are now very affordable and becoming a standard tool to have on the bench. The camera is tiny and plugs into my iphone.
