2. misc-audio
  3. 191869-5650

101D Triodes

I have a Coincident Technology Statement Mk III Line Stage Preamp It uses a matched pair of 101D-L triodes. One tube has failed necessitating replacement of the pair. These were Psvane WE Replica Line (silver line). I have used (or tried) Lanlai 101D Mesh Plates, and found them pretty noisy. It was mentioned to me that the mesh plate contributed to the noise. I am seeking any thoughts from those experienced with the Sophia Electric 101D-L Mesh Plate. Generally, there longevity and of course there sonic qualities. I have in the pass used a Sophia Electric 274B rectifier in a head phone amp and was impressed, but had the opportunity to hear it in someone else's rigg before I purchased one for my own.

Also Full Music makes this tube, if you have experience with these, please advise. Thank you, Brad

128x128bradf
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bradf OP
329 posts
 

@sns 

Update:  Awaiting response from Israel regarding 300B mod.

Added up hours on my 101D WE Rep before failure.  Came to 561.0

 

sns
3,203 posts
 

I'd say it appears the new value resistors you installed may have helped extend life of tubes, prior to installation of new value I  fried a number of tubes at just around 100 hour mark, doubt I ever came close to 500 hours on any of the premium tubes. Could be just a bit more control of variances with the tighter tolerance Ohmites could make all the difference, or not?

bradf's avatar
bradf OP
329 posts
 

Here are the detailed electrical specification differences between the NOS Western Electric 101D and the current production PSVANE 101D-L vacuum tubes:

Specification NOS Western Electric 101D PSVANE 101D-L
Heater Voltage 4.2V 4.5V
Heater Current 1.0A 1.0A
Maximum Plate Voltage (Ua) 130V 190V
Maximum Plate Current (Ia) 7.7mA 30mA
Power Rating 15W 15W
Direct Interelectrode Capacitances Input: 4.8 µF, Output: 5.2 µF, Grid to Plate: ≤ 3.3 µF Input: 4.8 µF, Output: 5.2 µF, Grid to Plate: ≤ 3.3 µF

The main differences are in the heater voltage and maximum plate voltage, with the PSVANE 101D-L having slightly higher values. This means the PSVANE 101D-L can handle higher voltages, making it suitable for a wider range of applications.

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