Best 2a3 PP OPT. - 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 31st May 2012, 01:20 PM   #1
diyAudio Member
 
Join Date: Sep 2003
Location: London
Default Best 2a3 PP OPT.

What's the best OPT you've come across for 2a3s in PP?

1) Where in the range of 3K - 6.6K primaries?
2) Which make?

My experience is that O-netics 6.6K is really good - that's my main listening amp - but I'm looking at a second amp and what's available internationally - Silk, James, Lundahl, AE, US makes and other exotics.

Also interested in good value choices. One is the Danbury 6.6K one Maplins used to sell in the UK. Surprisingly good and very cheap. another is Hammond 5K 1615A, never heard that but right kind of specs.

So generally looking around for opinions! I'm using 2a3 PP amps now instead of 300b SETs. Prefer the sound after several comparisons.

andy
  Reply With Quote
Old 31st May 2012, 02:28 PM   #2
diyAudio Member
 
Join Date: Sep 2003
Location: London
Here's a couple of references:

Hashimoto HW-15-5 5K PP $478 pair
Results for Transformers:Output - Push Pull

Silk P-50-15A 5K PP $375 pair SACThailand

Andy
  Reply With Quote
Old 31st May 2012, 02:37 PM   #3
vuki is offline vuki  Croatia
diyAudio Member
 
vuki's Avatar
 
Join Date: Jun 2002
Location: zagreb, croatia
I'm using Slovenian ASV Sebart AOT40. Excellent on measurement & great sound.
  Reply With Quote
Old 31st May 2012, 03:03 PM   #4
diyAudio Member
 
Join Date: Sep 2003
Location: London
also:

Tamura F-483 5K PP 15W, 4*,8*,16*

Tango FE-25-5 25W 5K 4,8,16 160mA 83x78x81 1.6Kg

ASV looks interesting! I've been to Slovenia - lovely place, and people there very educated and musical.

Andy
  Reply With Quote
Old 31st May 2012, 03:35 PM   #5
diyAudio Member
 
Join Date: Apr 2005
Location: Maryland
I have heard several PP 2A3 amps using vintage Chicago OPTs that came from Eico monoblocks. The Eico HF-20, -22 and -35 all used the same OPT which is 6.6K as I recall. The HF-50 and -60 used different transformers. I have several of these OPTs that I plan eventually on using for PP 2A3 amps, but haven't gotten around to it yet.
  Reply With Quote
Old 31st May 2012, 03:42 PM   #6
diyAudio Member
 
Join Date: Sep 2003
Location: London
Hi Salectric!

I'm getting great results from 26 into 4P1L interstage coupled to 2a3PP. I like the old Chinese biplates - nice and mellow. I find the Sovteks hard sounding. Got some 6C4C as well - should sound nice. I'm using Lundahl LL1660PP interstage, and Hammond 124b plate chokes on the 26 pairs, direct coupled to 4P1Ls. The 124b are half nickel stepdown transformers so I just use one side with the CT as a plate choke - lovely sound. I've been blown away by the detail and musical sound. Better than my 300b SET amps.

It's worth using some nice iron - interstages and plate chokes. Makes a big difference!

Andy
  Reply With Quote
Old 31st May 2012, 05:55 PM   #7
diyAudio Member
 
nullspace's Avatar
 
Join Date: Oct 2004
Location: Phila., PA
Hi Andy,

Another opt to look at is the S240A from Magnequest. It's 5k & 20W. $225each in M6, $500 per for nickel. I'm using them in a parafeed 2A3 PP amp and like them very much.

Regards,
John
  Reply With Quote
Old 1st June 2012, 11:55 AM   #8
JimW is offline JimW  United States
diyAudio Member
 
Join Date: Oct 2004
Hi Andy,
I used the Hammond 1615 in my first pp 2a3 amp, to see if I liked the idea and sound of 2a3 in pp. The amp itself was based on a design posted here by F.DeGrove, using a paraphase inverter. I did, in fact like the sound, and the amp evolved into a "amity" styled amp (all transformer coupled). I am now using lundahl 1623am outputs. I am not going to bash the hammonds, they give good sound and value for the money, however comparing them to the boutique brands mentioned, they will fall short, particularly in nuance and frequency extremes.
  Reply With Quote
Old 1st June 2012, 02:16 PM   #9
diyAudio Member
 
Join Date: Sep 2003
Location: London
Hi Jim,

That's useful to know. So the 1615 is "good but outdone by better makes". I assume all the usual suspects, Hashimoto, Tango, Tamura, O-netics, Silk etc.

andy
  Reply With Quote
Old 1st June 2012, 02:56 PM   #10
diyAudio Member
 
Join Date: Apr 2005
Location: Maryland
JimW, Do you have a link to the Frank DeGrove design you mentioned? I am interested in trying a paraphase inverter and that may give me some ideas.
  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
2A3 PP Can my OPT do the job? jgray Tubes / Valves 18 27th February 2012 01:33 AM
What to do with this PP OPT? pwan Tubes / Valves 1 7th November 2008 02:36 AM
Sizing PP OPT alexg Tubes / Valves 14 11th June 2007 07:19 AM
James SE OPT for 300B & 2A3 on eBay argo Tubes / Valves 0 20th January 2005 11:21 AM
2a3 Se Amp With 5k Opt? zxx123 Tubes / Valves 4 1st September 2003 12:01 PM


New To Site? Need Help?

All times are GMT. The time now is 11:44 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