Need advice for transformer for tube GM 70. - 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 8th August 2007, 12:04 PM   #1
diyAudio Member
 
Join Date: Feb 2006
Location: Ukraine Kiev
Send a message via AIM to goodspeaker Send a message via MSN to goodspeaker Send a message via Yahoo to goodspeaker
Default Need advice for transformer for tube GM 70.

Need advice for transformer for tube GM 70.

Hi
Want to make SE tube amplifier based of GM70 Russian tube like this one http://www.dehavillandhifi.com/GM70_2003.htm
Hope for your advice for transformer.
Not decided yet monoblok to made or three amplifier in one case.(Three because it is for front speaker of home theater)
Need really good quality transformers for best possible sound.
Need
output transformer. The same as for 845, 211 tube.
power transformer V=850-900v, I=150mA(if monobloc) or 0.5A (if or three amplifier in one case) .
Chokes L=10H, I=150-200mA.

I fond all these transformers in Hammond brand
output transformer -1638SEA http://www.hammondmfg.com/1627.htm
power transformer - 726 http://www.hammondmfg.com/700.htm
Chokes - 193J http://www.hammondmfg.com/193.htm

but I look the web , it seems that Hammond not best brand in tube transformer.
See Hashimoto Electric looks much better but it do not make output and power transformer I need.

Need your good advice is those Hammond are worth to buy?
Or you can suggest me other brand?
I prefer European brands because of delivery cost.
__________________
--
  Reply With Quote
Old 8th August 2007, 01:48 PM   #2
diyAudio Member
 
the_manta's Avatar
 
Join Date: Nov 2006
Location: Munich, Bavaria
Hi !
Well Hammond....
Let's put it this way: There better transformers out there.
They are heavy and give a good bass, but mine lacked in the high frequency range.

Long ago I made a list of output-transformer dealers. Meanwhile others added lots of pages and dealers.
Look here

Regards, simon
__________________
Терпенье и труд все перетрут
  Reply With Quote
Old 9th August 2007, 08:40 AM   #3
316a is offline 316a  England
diyAudio Member
 
316a's Avatar
 
Join Date: Dec 2002
Location: West London
Default Re: Need advice for transformer for tube GM 70.

Quote:
Originally posted by goodspeaker
Need advice for transformer for tube GM 70.
Need your good advice is those Hammond are worth to buy?
Or you can suggest me other brand?
I prefer European brands because of delivery cost.
No idea about Hammond , Sowter of the UK provide excellent transformers and service from experience . You may need to implement DC filaments on these valves , I could not get the hum down to acceptable limits using AC .


cheers

316a
  Reply With Quote
Old 9th August 2007, 09:41 AM   #4
diyAudio Member
 
Join Date: Feb 2006
Location: Ukraine Kiev
Send a message via AIM to goodspeaker Send a message via MSN to goodspeaker Send a message via Yahoo to goodspeaker
I sow Sowter web
seems TYPE SA11 is suitable for my purpose
price 180.42 =360Usd + delivery

And I see http://www.thlaudio.com/indexE.htm
James transformer 6159HS cost 400USD with delivery


price of both the same.
Which is better????

James looks more beautiful with Encapsulated Package.
Sowter has option of Encapsulated Package but the cost is 80 more.
__________________
--
  Reply With Quote
Old 9th August 2007, 10:19 AM   #5
Tweeker is offline Tweeker  United States
diyAudio Member
 
Join Date: Dec 2004
Location: Cincinnati, Ohio
Oof, I have no idea, but at those prices Id be looking at using copper plate GM70s over graphite. OPT choice may be a matter of taste and/or operating point, speakers in question etc, rather than 'better'.

You will likely need DC filaments if speaker efficiency isnt poor. I would recommend a choke input supply here.

If allowed I would probably separate the amplifier into a power block and an amp block. This will ease chassis layout with regard to magnetic interference issues, not to mention a monoblock will be a back breaker.
__________________
Be sure your foil hat has a good low impedance ground.
  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
need diy tube preamp (line-stage) recommendation and general tube advice Musiclover4 Tubes / Valves 16 18th May 2013 03:19 PM
newbie needs transformer advice taichiguy Multi-Way 0 22nd March 2006 03:12 AM
aleph3 transformer advice cowanrg Pass Labs 15 17th April 2004 08:19 AM
toroid Transformer as power Transformer for tube tone Tubes / Valves 7 11th February 2003 08:57 AM
toroid Transformer as output Transformer for tube preamp? tone Tubes / Valves 15 2nd February 2003 04:36 AM


New To Site? Need Help?

All times are GMT. The time now is 10:11 AM.


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