voltage amplifying board + Base board configure
Like M2's and V-Fet input stage (Mark's design), the Lufet driving stage is divided into two boards: the base board, on which the line regulators and the transformer are mounted; the amp board, the op and headphone amp are soldered.
Jumpers are put in for convenient modes: high gain, low gain, IC direct output(no transformer), auto-transformer and normal transformer.
Like M2's and V-Fet input stage (Mark's design), the Lufet driving stage is divided into two boards: the base board, on which the line regulators and the transformer are mounted; the amp board, the op and headphone amp are soldered.
Jumpers are put in for convenient modes: high gain, low gain, IC direct output(no transformer), auto-transformer and normal transformer.
Attachments
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Mine were 5 times your price, plus bank charges, plus shipment.
But pre-matched by Grey Rollins those days.
And have no problems getting quads curve traced to 0.3% in a triode cell.
And very good yield from a batch of 100.
Patrick
Many of the Spice models of LU1014 are miles out and do not reflect reality, especially in triode mode.
The only one that works for me (in triode mode) is from DIYA member Kekso22 :
LD1014 SPiCE models
Attached is, as an example, a circlotron power follower with the triode cell, al la Zen V9.
Note high Zout.
Patrick
.
The only one that works for me (in triode mode) is from DIYA member Kekso22 :
LD1014 SPiCE models
Attached is, as an example, a circlotron power follower with the triode cell, al la Zen V9.
Note high Zout.
Patrick
.
Soldering
Finally, all components have been received. Specially, Edcor transformers are here. The order was put on July 14. It took a long while.
The Edcor transformer ordered for the voltage stage is PCW Series - 1/2W balanced 150:150.
The 600:10K ones are for other job.
Finally, all components have been received. Specially, Edcor transformers are here. The order was put on July 14. It took a long while.
The Edcor transformer ordered for the voltage stage is PCW Series - 1/2W balanced 150:150.
The 600:10K ones are for other job.
Attachments
THD+N
It is expected. The voltage stage with audio IC and buffer will have excellent number.
the purpose of the test is just to confirm flawless PCB design and components layout.
L channel at 150 ohms load, THD+N 0.00075% at 1Vrms, 0.0035% at 8.15Vrms output, DC offset 5.5mV.
R channel at 150 ohms load, THD+N 0.0011% at 1Vrms, 0.0066% at 8.1Vrms output, DC offset 6.5mV.
It is expected. The voltage stage with audio IC and buffer will have excellent number.
the purpose of the test is just to confirm flawless PCB design and components layout.
L channel at 150 ohms load, THD+N 0.00075% at 1Vrms, 0.0035% at 8.15Vrms output, DC offset 5.5mV.
R channel at 150 ohms load, THD+N 0.0011% at 1Vrms, 0.0066% at 8.1Vrms output, DC offset 6.5mV.
