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

@sns 

Israel, sent me a letter describing the problem with the circuit for the heater element along with the sand cast replacement resistors.  Considering the quality of the Coincident products, It doesn't make sense (at least to me) that this heater circuit incorporated sand cast resistors in the first place.  Pending what Israel has to say about MK III 300B conversions, I probably will have my Statement Pre., modified to incorporate the Ohmite resistors. Due you have reference to the type or part number of the Ohmite you used? In between tube replacement and resistor mods., I will put my Ars Sonus Filarmonia (w/coupling cap mod) into my system.  I have been wanting to do this for a while now since I never used it with the Devore Super 9's I purchased in 2022.  I got to get back to some work I have been doing in the yard to take advantage of the daylight.  I will post any additional info I find on the subject, and what Israel has to say with regard to a possible 300B mod.  Thanks,  Brad

 

Hey Brad, here is part, https://partsconnexion.com/ohmite-resistor-0r33-0-33r-ohm-12w-ag12-series-1-tolerance/ .33uf 12v 1% tolerance

Let me know on 300B mod, I seem to have slightly recall of asking about this, if I remember correctly he wasn't recommending, too much work and expense. I may be incorrect on this.

 

In looking back on my emails with Israel, replaced resistors back in mid 2022, so hours on tubes without any failures has to be in multi hundreds.

I will let you know what Israel says about the mod.  Since there is no mention of it on the Coincident web site, my thought is that you are probably right.

Thnx for the Ohmite info.  When I add up the hours on the tubes, I will let you know how much time I accumulated on them.

I'm hoping someone here can provide info on the FJ Full Music and / or the Sophia.

 

 

I doubt very much mod is simple, 300B vs 101 tubes have very different operating parameters.

I do have personal experience with TJ Full Music 845 tubes, one blew at about 100 hours, never again.

 

There is one other option for 101 tubes, there are vintage 101 tubes such as Western Electric, if one is lucky could find NOS. Pricey but not out of this world, also need tube socket adapter as pins are all one size vs two of each size on modern 100. Don't know about specs, meaning don't know if they can handle Statement plate or heater voltages. I've long been curious about this as vintage tubes generally built with longevity and durability in mind. Ask Israel about this, I can never get a straight answer from him about this, I suggest you let him know you're fed up with the whole tube situation, perhaps he can come up with some solution. Its possible he could give some accommodation on 300B Statement for those with the 101 based Statements, especially for those he sold in recent years when he understood bad situation with 101 tubes. Without quality 101 tubes we are left with preamps that don't perform as intended. Furthermore I've spent good money with many updates on my pre, capacitors, resistors, Amtrans rotary selectors for upgraded TVC's, been through at least $3k in bad tubes. One more blown tube and I'll probably be looking at a new pre, for sure 300B based, only DHT pre and amps for me. I've had such good luck since Ohmite resistors tube failures kind of left my mind, your failure with new value pieces has me on edge again.

@sns 

Update:  Awaiting response from Israel regarding 300B mod.

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