![WP_20140603_002[1].jpg](/community/data/attachments/392/392747-4d79c0fc3d862ef35a32f844a309d580.jpg?hash=TXnA_D2GLv)
![WP_20140603_003[1].jpg](/community/data/attachments/392/392764-a0a3c6173c5b8e473b990ea785ea600f.jpg?hash=oKPGFzxbjk)
A detailed photo of the wiring will be helpful, to debug any oscillation problems.
But 10mV of ultrasonics should not be enough to give such a bad reading for anode current.
But 10mV of ultrasonics should not be enough to give such a bad reading for anode current.
With a 10Ω resistor for filament bias, you need 16,5-17,5V on the input, as shown on the diagram you posted.
![WP_20140603_004[1].jpg](/community/data/attachments/392/392778-b26f280b3e32e29cf2524be10bc37926.jpg?hash=sm8oCz4y4p)
Grid Wiring is much too long.
It would be better to mount the input sockets very near to the 26.
But, if you don't want to do that, please change the grid wire to screened cable (high quality). Quality Microphone cable can be used.
It would be better to mount the input sockets very near to the 26.
But, if you don't want to do that, please change the grid wire to screened cable (high quality). Quality Microphone cable can be used.
Off-load voltage does not matter. On-load, it must be 16V minimum, 17V normal.
Please check the PDF manual.
Above ~400mm wiring, You need to add Cap 1000uF 35V at the input to the Regulator, right at the PCB.
Panasonic FC, FM etc. is preferred.
Above ~400mm wiring, You need to add Cap 1000uF 35V at the input to the Regulator, right at the PCB.
Panasonic FC, FM etc. is preferred.
Shortened the cable to 1 meter and added the capacitor 100uF 63V Pana FC at the regs input. Attached measurements right channel new tube.
OK, it should be working and sounding OK now?
The cap should be 1000uF, or at least 470uF.
When the grid wiring is shortened, or shielded, it should sound very good!
The cap should be 1000uF, or at least 470uF.
When the grid wiring is shortened, or shielded, it should sound very good!
Felipe, Have you corrected the low voltage at the Regulator input? for 10 ohm you need 16,5V min.
If that does not fix it, please post a photo of the regulator, so that I can see all the parts.
If that does not fix it, please post a photo of the regulator, so that I can see all the parts.
Rod, both regs hace two equal and separate PSU, following your advice I check both PSU to ensure your regs have proper DC input.