Simple P P build cost - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 12th March 2010, 10:03 PM   #1
diyAudio Member
 
Join Date: May 2008
Location: Towson, Maryland
Default Simple P P build cost

I hope this will be my first tube amp build. I have limited experience in modding crossovers and playing around with SS amps. I would like to build a good amp not the cheapest not the most expensive and I am thinking on just going for the EL34.

It appears that the transformers are the biggest expense and I do not know anything about the Transformers and I am going to rely on everyones input as to what transformers work best at a reasonable price point.

Thanks for any input.

Scott
  Reply With Quote
Old 12th March 2010, 11:44 PM   #2
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
What is your price point?

Simple SE build costs
  Reply With Quote
Old 12th March 2010, 11:48 PM   #3
diyAudio Member
 
Join Date: May 2008
Location: Towson, Maryland
I am not sure yet. I am hoping sub $400.00 USD. I think it is going to depend on the iron.

Scott
  Reply With Quote
Old 12th March 2010, 11:55 PM   #4
diyAudio Member
 
Join Date: Jan 2007
Location: Minnesota
I assume you mean El84?

The 6CW5 PP would be a bit cheaper if you wanted to go that route. Those tubes run around $5 each compared to the El84s run around $10 each. You would also not need to purchase a rectifier tube and the power transformer should be a bit cheaper too. Just something to think about if you are really looking to go the cheaper route.
  Reply With Quote
Old 13th March 2010, 12:21 AM   #5
diyAudio Member
 
Join Date: May 2008
Location: Towson, Maryland
I guess I am trying to find out the cost of each route so I can decide if I need to got the cheaper route or not.


And yes I did mean EL84.

Scott
  Reply With Quote
Old 13th March 2010, 12:29 AM   #6
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
$400 total or for the OPTs? Figure about $100 for a pair Edcors, which are a very solid OPT for that price point. There is always Hammond for more $$ but not necessarily more performance.
  Reply With Quote
Old 13th March 2010, 01:00 AM   #7
diyAudio Member
 
Join Date: May 2008
Location: Towson, Maryland
$400 Total. Working amp less chassis. I will build that from stuff i have laying around.

I guess I would like to see a spread sheet type set up with different output tubes and Transformers and approximate cost for each variant in a general sense.

EL 84 Transformers# Cost 6CW5 Transformers# Cost

Cheap

Mid

$$$


I am a newbee just trying to learn and at this stage all the different transformer # and voltage rating for this and that make my head spin.
I think I just need a starting point to start understanding everything and I can take it from there. I am greenhorn in the tube amp building arena.

Thanks
Scott
  Reply With Quote
Old 13th March 2010, 01:16 AM   #8
diyAudio Member
 
Join Date: Jan 2007
Location: Minnesota
Well the component cost will be almost identical if you go with the el84 amp or the 6cw5 with the exception of some diodes otherwise the cost there should be the same.

The power transformer for the 6cw5 is $30 plus I think it was $10 shipping from antekinc.com

Output transformers would be $47.13 each from edcor plus shipping. You would have to find out which would be the prefered transformer but I think the CXPP25-16-7.6K would work with an 8ohm load. I could be wrong.
  Reply With Quote
Old 13th March 2010, 04:30 AM   #9
Ian444 is offline Ian444  Australia
diyAudio Member
 
Join Date: Nov 2008
Location: Brisbane QLD
Default For the EL84 build...

Scott, you should be able to do it for under $400. So far, for an EL84 version with tube rectifier, this is what I can work out. For a 6CW5/EL86 build, the tranny choices here do not apply.

PCB, $43. Parts for PCB, around $100 or less, including sockets and 5AR4 rectifier tube. Less if you use parts from your stash.

Possible power tranny choices:
Edcor XPWR131, 120Vrms, 60Hz. 660V(330-260-0-260-330)@175mA, 6.3V@4A & 5V@3A, $61.89 USD
Edcor XPWR008, 120Vrms, 60Hz. 600V(300-0-300)@200mA, 6.3V@4A & 5V@3A, $53.77 USD
Edcor XPWR066, 240Vrms, 50/60Hz. 600V(300-0-300)@200mA, 6.3V@4A & 5V@3A, $63.36 USD
Hammond 372HX, universal primary, 300-0-300@230mA, 6.3V@6A, 5V@3A, USD$120 Angela.com.
Hammond 372FX, universal primary, 300-0-300 @ 173mA, 6.3V@5A, 5V@3A, USD$105 AES, USD$83 Triode Elec.
Magnetic Components, 2 x 120V primary, 355-305-0-305-355@200mA, 6.3V@5A, 5V@3A. Triode Elec P/N 40-18029 for Fender Twin guitar amp, USD$80.
Antek 2T300, 2 x 115V primary. 2 x 300V@300mA, 2 x 6.3V@4A, $35 USD. No rectifier winding, but maybe we can fix this, read below.

Possible output tranny choices:
Edcor CXPP25-MS-7.6K, 4-8-16 ohm taps, $57, or USD$47 for a single output tap. 5.25lb.
Dynaclone Z565, 8K primary, 4-8 ohm taps, $79. 4lb.
Electraprint, 7K6 primary, UL taps, max DC 40mA, 20W, 4-8 ohms secondary, USD$95.
Hoping Bud from O'netics will come back with a quote next week.
There's also Hashimoto HWC-30-8 30W for $180 each, or Silk P-60-15A 15W for approx $100 (but George recommends 20-50W). I would love to spring for the Hashi but it sort of destroys the budget.

Have a read of Georges tubes and transformers pages here, this is what we should be going by to make the decisions.

So with Edcor $47 output trannies and Edcor power tranny (say $60) we are up to around $300, so there is still room to move, but we are not there yet, and no shipping has been included. I have no idea of internal USA shipping costs. If you need to buy EL84 tubes I think a matched quad of JJ EL84 is around $60 or less, I have heard nothing but good things about these tubes and the guitar guys testify they can handle 350V to 400V reliably. Plus George put a set through the torture rack and they survived...one started glowing a bit at 420V.

This hypothetical $300 does not include: IEC inlet, power cord, fuse, power switch, RCA sockets, banana sockets, EL84 tubes, chassis or volume pot. This stuff can add up and the stash box comes in handy to reduce costs. There may be other stuff I've missed. I will be using some Russian 6P14P as I already have some, they are cheap and plentiful. If the B+ is too hot for them, I'm thinking of lowering the screen grid voltage to make them comfortable, or get some JJ EL84.

There's many ways to go about this. This is also my first build and man its agony making these decisions on iron. Keep in mind these examples of iron are simply what I have been looking at and is by no means what someone else may call a good choice. I am not ready to pull the trigger on any iron yet, but have all the rest on the way.

I am thinking of using the Antek 2T300 power tranny and modifying one of the 6.3V windings for 5V or make a new winding for 5V for the rectifier. I am not sure if this is a good choice. George recommends a 320-0-320 tranny. So proly best to find one like that. It's early days and we will find out more as the beta builders complete their building/testing/fine tuning.

Ian.
  Reply With Quote
Old 13th March 2010, 05:07 AM   #10
Ian444 is offline Ian444  Australia
diyAudio Member
 
Join Date: Nov 2008
Location: Brisbane QLD
A simple spreadsheet to run with...
Attached Files
File Type: zip Parts list EL84 Simple PP 1.zip (3.3 KB, 127 views)
  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
simple se build skipper Tubelab 151 2nd October 2009 12:47 PM
looking for simple speker build help colin.hepburn2 Full Range 19 20th September 2008 12:55 PM
Total cost to build a chipamp kit? sqlkev Chip Amps 20 25th May 2005 06:53 AM
So how much does a Gainclone cost to build anyway? mikejz84 Chip Amps 24 7th October 2003 12:45 AM
Aleph 4 cost to build? Al.M Pass Labs 3 14th August 2001 05:58 PM


New To Site? Need Help?

All times are GMT. The time now is 11:21 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