Due to the fact I cannot find 4 pin sockets that solder to board I went with sockets that bolt to the top plate. Looking for advice on this method, seems a construction challenge to me
You are right! It can be done but it is a challenge.
Instead, this is what I will get: https://www.tubedepot.com/products/...Lst-y44d0W4NAl7njU-Jz9v-wFyLbtfjKb4ldlvOu38mw
Or how about these: https://www.goodcomponent.com/produ...2a32a3b2a3c300b811274a5z3101d-ez-4b-1808.html
Instead, this is what I will get: https://www.tubedepot.com/products/...Lst-y44d0W4NAl7njU-Jz9v-wFyLbtfjKb4ldlvOu38mw
Or how about these: https://www.goodcomponent.com/produ...2a32a3b2a3c300b811274a5z3101d-ez-4b-1808.html
Not sure which ones you got but I use these and just ignore the flange. It can also be cut off as it is quite thin. I have built boards with all three types of sockets shown. The original amps used a ceramic version of the black bakelite socket that is still available in the goodcomponent link and on Ebay. They seemed to have vanished in the last few years. The flanged version that I have used is available at AES, Ebay and several other places. Mount the board to the top plate with enough space that the flange is just below the plate using the four corner mounting holes with spacers or multiple nuts. You should also use a fifth mounting support to prevent board flex when changing tubes using any of the many extra holes in the board except the two between the output tubes as they are connected to board ground.
https://www.tubesandmore.com/products/socket-4-pin-ceramic-chassis-mount
Attachments
Hey guys,
Just getting everything ready for my TSE II build and noticed I possibly ordered the wrong transformer and choke. I must have got lost in all the posts I read in the thread and mixed information for different builds/setups. I plan on running 300B tubes.
I ordered the Hammond 370HX, George mentioned, in post #303, for the higher current to run 2A3s
My question is will this transformer be ok for 550v CT running 300B tubes, or should I order the 372HX which is 600v CT?
I know Hammonds have been known to run a bit above their rating/voltage. They certainly did on my last build.
The choke I ordered is the 193 G, 10H 150 ma dc 102 ohm choke.
Looking forward to getting this build going. This is my 3rd tubelab amp.
Thanks for the help!
Just getting everything ready for my TSE II build and noticed I possibly ordered the wrong transformer and choke. I must have got lost in all the posts I read in the thread and mixed information for different builds/setups. I plan on running 300B tubes.
I ordered the Hammond 370HX, George mentioned, in post #303, for the higher current to run 2A3s
My question is will this transformer be ok for 550v CT running 300B tubes, or should I order the 372HX which is 600v CT?
I know Hammonds have been known to run a bit above their rating/voltage. They certainly did on my last build.
The choke I ordered is the 193 G, 10H 150 ma dc 102 ohm choke.
Looking forward to getting this build going. This is my 3rd tubelab amp.
Thanks for the help!
Hi Steady7, I have been looking recently at what transformers to buy for a 300B TSE, and referred back to this page:
Tubelabs SE: Tubes and Applications
It looks like 550VCT will not be ideal if you are shooting for that sweet spot he mentions.
I have decided to go for a Toroidy custom offering which I have an old quote for for €113.50 ...
I was informed that the 550 V 370HX is being exchanged for a 600 V 372HX.
Thanks for the reply guys, already received the 372 HX, I figured it was going to be a tad under voltage for the 300B tubes but just wanted to make sure. I tried to do all my research before hand. I think I have read through this thread more than a few times, but got my information crossed. Appreciate the help!
So you already have the 382HX with 600 CT secondary? I was thinking if you switched to SS rectification with the 370HX you could get close to where you would have been with 5AR4 rectifier and the 372HX.
I have a TSE-II that's powered with a 372HX. I run some Chinese 2A3's WAY OVER SPEC at 70 mA each and My B+ runs from 375 to 390 volts depending on line voltage. Those tubes are 20 years old and have been in the amp for about 5 years. Ever see blue glow on the glass of a DHT? They still sound nice but have lost some of the glow.
Attachments
I was able to return the other transformer for the cost of return shipping. Appreciate the potential solution though. Chassis is on its way so hopefully I can start assembly this weekend or next.
What size fuse should I use with 300B tubes I have the edcorXPWR178-120 660V paper transformer
Here we go, getting the layout finalized for the TSEII 300B. Almost ready to hack up this beautiful chassis! Also included is a picture of my completed SPP, finished last year, by far my favorite amplifier I currently have!
Using all Hammonds
Main transformer 372HX
Output 1628SEA
193G choke, may be a little large, we will see
Mundorf supreme coupling caps
Using all Hammonds
Main transformer 372HX
Output 1628SEA
193G choke, may be a little large, we will see
Mundorf supreme coupling caps
Attachments
Starting my initial checkout I have 8.4 volts dc on the 5842 heaters and 6.9V ac at t1-grn. Power transformer decor XPWR178-120. Can I still continue checkout or will this destroy my tube
Thank you Tubelab for another great amp SSEII Did mine as a 300B up and running maybe a little hot at B+ of 431 I get a little distortion but running straight out of phone to small speakers
Doesn’t sound right if the heaters of 5842 has 8.4 Vdc. Are you sure R3 is not open? What is “6.9 v ac at t1-grn”? You mean the intended 6.3 Vac from the power transformer? Unloaded that might be a bit high, but OK. What counts is what the heaters see.
Last edited:
I meant to ask id R3 is not shorted, rather than “open”. It seems as if you have the full rectified DC voltage on the 5842 heaters.