Anthem Integrated 1 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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

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
Reply
 
Thread Tools Search this Thread
Old 18th June 2007, 10:13 PM   #1
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Default Anthem Integrated 1

Dear Guys

A friend of mine bring to me a Anthem Integrated 1 , to put some new tubes.

The strange thing is, the power transformer model Hamond H300211, have for the B+ a output of 355 Volts AC, that gives ~ 460 Volts DC.

To much for EL84, I'm afraid.

The hypotheses of primary error connection is not valid ,. because all the others voltages are correct:
-17,4 Volts AC for the negative bias voltage.
-11,7 Volts AC
-6,3 Volts AC for the tube heaters.

It seems to me that someone put in a transformer for a EL34 amp , as the rail voltage after rectification is around 460 Volts.

In a nutshell , I would be glad if anyone here can tell me , if the correct secundary voltage is effectively 355 Volts Ac or if that value is definitively wrong .

Thanks in advance for your help.

Cheers
__________________
Jorge
  Reply With Quote
Old 18th June 2007, 10:45 PM   #2
billr is offline billr  New Zealand
diyAudio Member
 
Join Date: Dec 2003
Location: new zealand
have you got a cct diagram?
  Reply With Quote
Old 18th June 2007, 10:48 PM   #3
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Quote:
Originally posted by billr
have you got a cct diagram?
No!

I send a mail to Sonic Frontiers , but no luck...
__________________
Jorge
  Reply With Quote
Old 19th June 2007, 01:18 PM   #4
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Even a internal pic could help!

No one?
__________________
Jorge
  Reply With Quote
Old 19th June 2007, 03:43 PM   #5
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Try contacting the folks at http://www.partsconnexion.com/ as most of the principle people from SF are now involved with this outfit and should be able to help you with your question.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 19th June 2007, 04:04 PM   #6
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Quote:
Originally posted by kevinkr
Try contacting the folks at http://www.partsconnexion.com/ as most of the principle people from SF are now involved with this outfit and should be able to help you with your question.
Thanks Kevin

I have already send a mail to Chris at "Partsconnexion" , following an advice from a guy in Audiokarma.

But till now, I don't have any answer.

From SF , they said that the voltages are correct , but i don't think so...

Regards
__________________
Jorge
  Reply With Quote
Old 19th June 2007, 04:27 PM   #7
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Might be that the original design used a more rugged version of the EL84 - something like the Russian 6P14P-EB or EV?

460V does seem rather high to me too.. I have an ancient Realistic Amplifier which uses voltages in the range of 410V which I have had to pad down to slightly under 400V. The Japanese tubes in this amplifier seemed able to take the abuse, as did the Philips ones I installed in my Dad's amp 30+ yrs ago, this one, recently acquired has 6P14P in it now after the JJ 6BQ5 I bought for it super novaed.

I am not familiar with the Anthem, is it possible that it drops some substantial voltage across resistors or chokes in the power supply? Operating currents may be as high as 200mA combined for both amplifier channels depending on operating point chosen. (The old Realistic amplifier uses very close to 50mA per tube including the screens.)

HH Scott ran 7189A in the 299B at rather high voltages, well over 400V IIRC, and fairly high dissipations as well..
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 19th June 2007, 04:36 PM   #8
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Quote:
Originally posted by kevinkr
460V does seem rather high to me too..
To me too, Kevin

And another "strange " thing , the bias negative supply have a 17volts zenner that has been changed for a 3,3k resistor , for a negative bias voltage of near 23 negatives volts.


The valves that it was using are JJ EL84.
__________________
Jorge
  Reply With Quote
Old 19th June 2007, 04:56 PM   #9
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Quote:
Originally posted by Tube_Dude


To me too, Kevin

And another "strange " thing , the bias negative supply have a 17volts zenner that has been changed for a 3,3k resistor , for a negative bias voltage of near 23 negatives volts.


The valves that it was using are JJ EL84.
That actually makes sense for the plate voltage being used, still that is way outside of the realm any 6BQ5 could be expected to survive long term. Zener regulation on the bias is not a good idea unless at least the screen voltage is regulated too. I would think the 6P14P would be a better choice than the EL84/6BQ5, and I think there might be another Russian one reputedly even better if you search here for it.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 19th June 2007, 05:13 PM   #10
diyAudio Member
 
Tube_Dude's Avatar
 
Join Date: Mar 2002
Location: Aveiro-Portugal
Quote:
Originally posted by kevinkr


That actually makes sense for the plate voltage being used, still that is way outside of the realm any 6BQ5 could be expected to survive long term. Zener regulation on the bias is not a good idea unless at least the screen voltage is regulated too.
Yep, Kevin

But no regulation in the screens , its a ultralinear design...
__________________
Jorge
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
3.1 integrated possible? Brit01 Tubes / Valves 4 5th July 2008 05:34 PM
WTB 211 or 845 integrated amp h00hbt Swap Meet 0 23rd March 2008 09:33 PM
What can $200-500 get you for integrated amp? chuck55 Solid State 5 12th February 2006 07:00 AM
Integrated Amp toman_9 Solid State 0 22nd January 2006 12:36 PM
Paradigm amplifiers? Anthem amplifiers? Corn-Picker Solid State 2 24th January 2004 03:10 AM


New To Site? Need Help?

All times are GMT. The time now is 08:51 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2