The Hundred-Buck Amp Challenge - Page 153

Printer2 · 17th August 2012, 12:51 AM

Any idea what you would like, what price range, what are your construction capabilities-resources?

hushpuppy · 17th August 2012, 01:57 AM

Hey thanks for asking !
there isn't much to try around here so I've been listening to a lot of clips and youtube stuff .. it seems like a trainwreck express clone or liverpool might be the way to go .. One guy that I really can't afford suggested a liverpool based amp with kt 77's - that sounded really intriguing . Maybe someday..
skills .. well I bought a fender blues jr and a friend helped me modify it .
Its on consignment right now and I should be able to get 5 or 6 hundred , US -out of it . It turned out to be everything I don't want in a amplifier.

so all my resources right now are tied up there .
And a complete build would probably be too much of a stretch at this point anyway .

So that's where I am right now

Printer2 · 17th August 2012, 03:02 AM

Since you were looking in a $100 amp thread maybe you might be interested in a low buck trainwreck type amp. Not sure if you can download this or you need to be a member of the Wattkins forum first.

Wattkins Amp Forums | Welcome To The Amp Builder's Community Center

http://www.wattkins.com/files/wattki...reck_Schem.pdf

The forum is in their 'Thrifty' series developing a Thrifty Train Wreck.

http://www.wattkins.com/node/17851

hushpuppy · 17th August 2012, 04:16 PM

perfect!

rock_mumbles · 24th August 2012, 05:21 AM

You probably can't build a Thrifty Wreck for $100 if you have to buy everything ... but you probably could get under $200
buying a Dirty Dawg chassis, Antek AS-05T280 PT, Hammond 125E (from STF), a set of tubes (I'd at least get a spare of each $2 ea) and sockets including shipping in the US will run under $150 ...

If you aren't a wattkins.com member and don't want to join you can find Thrifty Wreck files here: Directory Index ... and you can find a bit of information here as well: Wattkins.com Thrifty Wreck Tour

rock_mumbles · 24th August 2012, 05:28 AM

Quote:

Originally Posted by hushpuppy

... well I bought a fender blues jr and a friend helped me modify it .
Its on consignment right now and I should be able to get 5 or 6 hundred , US -out of it . It turned out to be everything I don't want in a amplifier.

...

If a BJ turned out to be everything you don't want ... what do you want ???

Printer2 · 25th August 2012, 12:27 AM

Quote:

Originally Posted by rock_mumbles

You probably can't build a Thrifty Wreck for $100 if you have to buy everything ... but you probably could get under $200
buying a Dirty Dawg chassis, Antek AS-05T280 PT, Hammond 125E (from STF), a set of tubes (I'd at least get a spare of each $2 ea) and sockets including shipping in the US will run under $150 ...

If you aren't a wattkins.com member and don't want to join you can find Thrifty Wreck files here: Directory Index ... and you can find a bit of information here as well: Wattkins.com Thrifty Wreck Tour

Why would someone not want to join and have the benefit of all the experience gained in that forum?

rock_mumbles · 25th August 2012, 12:38 AM

Good one Printer2 ...

I have talked to some people that feel that they are already involved with too many forums etc ... too many forums too little time ???

jazbo8 · 12:58 PM

Inspired by scott17 & Tubelab's postings at The Hundred-Buck Amp Challenge, I decided to give 6AF11 PP a go. My initial results were exactly the same as Tubelab's - oscillation galore. After trying a few different designs and layouts, I managed to get the amp to work, I used many off-the-shelf parts for the PS, the OPT is actually a bit over-sized for the job, but I can't find anything smaller here...

The rough BOM is as follows:

2 x 6AF11 - $2
12V 5A SMPS - $5
12V-260V 60mA DC-DC Converter - $3
10K:8 OPT - $16
R, C, pots, wires - $3
DIY chassis from sheet-metal wire-duct - $2
-------------------------------------------------------------
Sub-total - $31 (not including cabinet)

The schematic -> https://dl.dropbox.com/u/1326040/6AF11PP%20No%20TS.pdf

I am still fiddling with the design, it is a bit thin sounding at lower volume, so I may put in a coupling cap selector a la Orange. The filaments for the 6AF11 are wired in series and run directly off the 12V supply. The bias voltage is from a simple voltage divider off the 12V supply as well.

For those that're interested, the build-log -> 6AF11 Push-Pull Compactron Guitar Amp jazzbo8's adventure. Comments and suggestions are welcomed.

Jaz

Printer2 · 29th August 2012, 11:05 AM

Just took a quick look, have something to look forward to when I get home tonight. Where did you get the SMPS and the DC to DC converter?

17th August 2012, 01:57 AM	#1522
hushpuppy diyAudio Member Join Date: May 2012 Location: western pa	what Im thinkining Hey thanks for asking ! there isn't much to try around here so I've been listening to a lot of clips and youtube stuff .. it seems like a trainwreck express clone or liverpool might be the way to go .. One guy that I really can't afford suggested a liverpool based amp with kt 77's - that sounded really intriguing . Maybe someday.. skills .. well I bought a fender blues jr and a friend helped me modify it . Its on consignment right now and I should be able to get 5 or 6 hundred , US -out of it . It turned out to be everything I don't want in a amplifier. so all my resources right now are tied up there . And a complete build would probably be too much of a stretch at this point anyway . So that's where I am right now

24th August 2012, 05:21 AM	#1525
rock_mumbles diyAudio Member Join Date: Feb 2007 Location: Podunk, Idaho	Thrifty Wreck You probably can't build a Thrifty Wreck for $100 if you have to buy everything ... but you probably could get under $200 buying a Dirty Dawg chassis, Antek AS-05T280 PT, Hammond 125E (from STF), a set of tubes (I'd at least get a spare of each $2 ea) and sockets including shipping in the US will run under $150 ... If you aren't a wattkins.com member and don't want to join you can find Thrifty Wreck files here: Directory Index ... and you can find a bit of information here as well: Wattkins.com Thrifty Wreck Tour

28th August 2012, 12:53 PM	#1529
jazbo8 diyAudio Member Join Date: Jan 2011 Location: In Transient	My 6AF11 PP Amp - it works! Inspired by scott17 & Tubelab's postings at The Hundred-Buck Amp Challenge, I decided to give 6AF11 PP a go. My initial results were exactly the same as Tubelab's - oscillation galore. After trying a few different designs and layouts, I managed to get the amp to work, I used many off-the-shelf parts for the PS, the OPT is actually a bit over-sized for the job, but I can't find anything smaller here... The rough BOM is as follows: 2 x 6AF11 - $2 12V 5A SMPS - $5 12V-260V 60mA DC-DC Converter - $3 10K:8 OPT - $16 R, C, pots, wires - $3 DIY chassis from sheet-metal wire-duct - $2 ------------------------------------------------------------- Sub-total - $31 (not including cabinet) The schematic -> https://dl.dropbox.com/u/1326040/6AF11PP%20No%20TS.pdf I am still fiddling with the design, it is a bit thin sounding at lower volume, so I may put in a coupling cap selector a la Orange. The filaments for the 6AF11 are wired in series and run directly off the 12V supply. The bias voltage is from a simple voltage divider off the 12V supply as well. For those that're interested, the build-log -> 6AF11 Push-Pull Compactron Guitar Amp jazzbo8's adventure. Comments and suggestions are welcomed. Jaz Last edited by jazbo8; 28th August 2012 at 12:58 PM. Reason: typo

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17th August 2012, 12:51 AM	#1521
Printer2 diyAudio Member Join Date: Apr 2010	Any idea what you would like, what price range, what are your construction capabilities-resources?

17th August 2012, 03:02 AM	#1523
Printer2 diyAudio Member Join Date: Apr 2010	Since you were looking in a $100 amp thread maybe you might be interested in a low buck trainwreck type amp. Not sure if you can download this or you need to be a member of the Wattkins forum first. Wattkins Amp Forums \| Welcome To The Amp Builder's Community Center http://www.wattkins.com/files/wattki...reck_Schem.pdf The forum is in their 'Thrifty' series developing a Thrifty Train Wreck. http://www.wattkins.com/node/17851

17th August 2012, 04:16 PM	#1524
hushpuppy diyAudio Member Join Date: May 2012 Location: western pa	perfect!

25th August 2012, 12:38 AM	#1528
rock_mumbles diyAudio Member Join Date: Feb 2007 Location: Podunk, Idaho	Good one Printer2 ... I have talked to some people that feel that they are already involved with too many forums etc ... too many forums too little time ???

29th August 2012, 11:05 AM	#1530
Printer2 diyAudio Member Join Date: Apr 2010	Just took a quick look, have something to look forward to when I get home tonight. Where did you get the SMPS and the DC to DC converter?

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