Most expensive parts in DIY tube amp - 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 17th March 2015, 06:12 PM   #1
diyAudio Member
 
Join Date: Oct 2014
Default Most expensive parts in DIY tube amp

I've been thinking about doing a basic single-ended amp design as a first amp build. Something similar to this...

http://www.bonavolta.ch/hobby/en/audio/kt88.htm

But when I looked up output transformers they're 2-300 dollars for each, which would be 4-600 dollars for a stereo amp just in output transformers...My jaw just about dropped to the ground with that...Am I right? For an amp somewhere around 10WPC its gonna cost 500 bucks in output transformers? Or am I missing something... And also what are the other main expensive parts? I've assumed of course the tubes, which I'm guessing would be about $100 total for a stereo amp, the power supply transformer and inductor which I also didn't expect to top $100. And then besides that its mostly the case and miscellaneous resistors and capacitors etc. right?

But those damn output transformers...are they really that expensive?
  Reply With Quote
Old 17th March 2015, 06:31 PM   #2
20to20 is offline 20to20  United States
diyAudio Member
 
20to20's Avatar
 
Join Date: Jun 2010
Location: W-S, NC
You have a lot of researching to do before you decide on doing this project.
  Reply With Quote
Old 17th March 2015, 06:48 PM   #3
M Gregg is offline M Gregg  United Kingdom
Sin Bin
 
Join Date: Jun 2010
Location: UK
It all depends,

What are you trying to create?..yes I know its a SE amp however there are SE amps and SE amps..you can build to a budget.

Have you looked at the Edcor site?
There are SE output Tx's and output Tx's..what I'm saying is: If you build with Tango etc expect to pay..there are higher prices you could build with Audio note silver wound transformers which are ridiculous money..its a trade off..
This is just an example:

https://edcorusa.com/gxse15-8-2_5k

Regards
M. Gregg

Last edited by M Gregg; 17th March 2015 at 06:54 PM.
  Reply With Quote
Old 17th March 2015, 06:58 PM   #4
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
Everyone wants to build a single ended amp at first because they appear to be a simpler design. BUT besides less components single ended has bad PSRR and not to mention as you have noticed the price of output transformers, the output iron needs an air gap so the core doesn't saturate with the standing DC current, the air gap then causes the inductance to drop so in order to make up for it they use larger cores and more windings. You can use non air gapped smaller transformers if you go parafeed but then you will just end up spending the money in good quality chokes. Push pull transformers are smaller and cheaper, plus you get more audio watts and better PSRR and distortion cancellation.
  Reply With Quote
Old 17th March 2015, 07:01 PM   #5
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
I don't trust people who make dedicated detailed web pages about their cats.

http://www.bonavolta.ch/hobby/en/various/cats.htm
  Reply With Quote
Old 17th March 2015, 07:06 PM   #6
diyAudio Member
 
Join Date: Aug 2004
Location: florida
I spent $1000 on OPT transformers, worth every penny.
My last SET 10 yrs ago had some "off the shelf" iron and performed poorly.
If your going to build and SET, spend every dollar you can on the transformers.
  Reply With Quote
Old 17th March 2015, 07:10 PM   #7
diyAudio Member
 
Join Date: Dec 2010
Location: Amesbury, MA
I wonder how much Magz spent on his Monolith output iron for his 833C amp?

I wish I could find the thread where he posted pictures of them completed......they look sooooooo boss!!!
  Reply With Quote
Old 17th March 2015, 07:15 PM   #8
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
+2 on the Edcor recommendation - and don't overlook the excellent circuits and perhaps still parts offering at George's Tubelab
Tubelab | Dedicated to advancing the state of the art in affordable high end audio.

I built one of his SimplePP a few years back - happened to be able to recycle some vintage Scott P/P outputs, and settled on an Edcor power TX - do not try to save money on thermal rating of the Power TX

but yah, iron costs money, then there's the chassis and miscellaneous mechanical and passive circuitry parts that depending on how boutique you wanna go can easily run into several hundreds of dollars.
__________________
now on sabbatical
  Reply With Quote
Old 17th March 2015, 07:28 PM   #9
M Gregg is offline M Gregg  United Kingdom
Sin Bin
 
Join Date: Jun 2010
Location: UK
So you see,

We don't know if your trying to make Ongaku on the left.. mortgage money

Or something like this middle EL34 and right 6L6..which was a fun project..<<using Edcor..

Sorry just resized the pics..

Regards
M. Gregg
Attached Images
File Type: png Ongaku.png (63.8 KB, 515 views)
File Type: jpg Test.jpg (36.5 KB, 499 views)
File Type: jpg DSCN4008b.jpg (49.9 KB, 494 views)

Last edited by M Gregg; 17th March 2015 at 07:51 PM.
  Reply With Quote
Old 17th March 2015, 07:47 PM   #10
K.A.B is offline K.A.B  Sweden
diyAudio Member
 
K.A.B's Avatar
 
Join Date: Nov 2005
Location: Sweden
+3 on Edcor iron.

I have built an EL84 SE with Edcor opt and all who have listened are impressed but I'm looking to try a pair of Lundahl opt to see if it could be worth an update.

Anders
  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
Worlds Most Expensive Tube Amp !!! spirey Tubes / Valves 25 15th January 2013 02:12 PM
Expensive speakers with dirt cheap DIY-available drivers? uDIYguy Everything Else 5 11th November 2012 04:32 PM
FS: DIY Tube parts, tubes 845's teflon, tube phono PCBs tronan Swap Meet 4 3rd December 2011 01:19 AM
I'm anti-expensive audio parts but man, a good capacitor can make a difference jduffy Tubes / Valves 6 25th April 2007 04:13 AM


New To Site? Need Help?

All times are GMT. The time now is 09:51 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2