Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Q1, 300B S-Splot, 360V 60mA? Q2, James 6112HS or 6123HS?
Q1, 300B S-Splot, 360V 60mA? Q2, James 6112HS or 6123HS?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 28th February 2011, 08:20 PM   #1
HighVividity is offline HighVividity  United States
diyAudio Member
Join Date: Nov 2006
Default Q1, 300B S-Splot, 360V 60mA? Q2, James 6112HS or 6123HS?


I am working on my first 300B project. I have two questions.

1. People talking about 300B sweet spot (for example, http://www.diyaudio.com/forums/tubes...es-6123hs.html) suggests 360V, 60mA。Does this 360V refer to B+ voltage, or voltage across tranformer+300B, or voltage across 300B only?

2. I am going to buy James transformer. 6112HS can handle 70mA, 10W. 6123HS can handle 90mA, 20W. Of course, price wise, 6112HS is less than 2/3 of 6123HS。Which sounds better for a pair of 300B working with 360V, 60mA?

I seems 6112HS can work well in this condition. but it seems people are using 6123HS for 300B and 6112HS for 2A3,and the transformers are advertised so too. This makes me wondering. Please share your experience with me. Thank you!
  Reply With Quote
Old 28th February 2011, 10:26 PM   #2
tomchr is offline tomchr  Canada
diyAudio Member
tomchr's Avatar
Join Date: Feb 2009
Location: Calgary
I've seen numbers ranging from 50~60 mA @ 350 V to my preference 90 mA @ 400 V, 5 kOhm load. The voltage should be Vak not B+, though, in many circuits Vak is within a few volts of B+ and in those cases the figure could be either/or...

I would buy an OPT that allows for 100-ish mA. That allows you to experiment with the operating point and find what you like.

  Reply With Quote


Q1, 300B S-Splot, 360V 60mA? Q2, James 6112HS or 6123HS?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
James JS-6123HS pair - new in box specialidiot Swap Meet 2 8th September 2010 07:33 AM
Who knows James 6123HS parameters? Or where to ask HighVividity Tubes / Valves 2 10th June 2009 03:59 PM
james 6123hs totaltech Tubes / Valves 4 30th August 2008 12:21 AM
WTB - James 6123HS Transformers... Guiness Swap Meet 0 10th June 2008 11:44 PM
Max 300B SE output possible with James 6123HS ? ashok Tubes / Valves 4 17th June 2006 03:07 AM

New To Site? Need Help?

All times are GMT. The time now is 12:37 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio