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DIY audio: what are you building?

Paul Spencer

By Paul Spencer
in DIY Audio Projects

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Owen Y Grand Master

Owen Y

Posted
Posted
  On 06/02/2016 at 1:04 AM, RoHo said:

A couple shots of the rebuild of my push-pull 300B/6B4G amp. The power supply is going external which will free up space for more chokes and a separate supply for the input stage.

Top centre is the input stage which is from Allen Wright's PP2C design using cascode differential 6H30s.

Below that is the constant current sources for the inputs.

To the left is the voltage regulator, an "SSHV" designed by Salas of DIYAudio.

Between the output tube sockets is a little bias balance circuit to allow for precise matching of the plate currents.

Keep us posted on progress.

 

300B or 6B4G?

What OPTs?

 

Triode PP is excellent topology.

 

Cheers, Owen

Dark Lantern blog - http://darklanternforowen.wordpress.com/

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Bisguittin
Bisguittin

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betocool Champion

betocool

Posted
Posted
  On 17/03/2016 at 8:38 PM, lusk said:

ScanSpeak D2908/7140

Can purchase drivers from Audiotechnology

15H52 0613 SDKAM in 8 litres

8A77 2006SDKA in 45 litres

 

Get ready for your wallet to hurt though.

 

Thanks for the warning :)

 

Will have to move the project to the end of the pipeline.... he he

RoHo Veteran

RoHo

Posted
Posted (edited)
  On 17/03/2016 at 9:57 PM, Owen Y said:

Keep us posted on progress.

 

300B or 6B4G?

What OPTs?

 

Triode PP is excellent topology.

 

Cheers, Owen

Dark Lantern blog - http://darklanternforowen.wordpress.com/

It was 6B4G and then 300B , I tried both.  However the lack of space, with everything in one chassis, meant that the power supply was compromised to a level that I wasn't happy with.  I have some NOS 6B4G so the re-made amp, with separate power supply chassis, will use them.

 The amp was initially an EL34 kit from DIY Hifi Supply in Hong Kong using Chinese output transformers.  I hadn't planned on replacing them, due to the cost.  But then I thought, I'm pulling the whole thing apart and so if ever was the time to change output transformers, now is it.  Lundahl have a good reputation at reasonable prices so I bought a pair of LL1663 5k push-pull outputs.  All the metal-bashing and drilling ( the part I'm not much good at) are finished and the new parts installed.  Hopefully over this weekend I can fire it all up, without big bangs, and fine-tune the operating points.   :)

Edited by RoHo
Owen Y Grand Master

Owen Y

Posted
Posted
  On 18/03/2016 at 12:12 AM, RoHo said:

It was 6B4G and then 300B , I tried both.  However the lack of space, with everything in one chassis, meant that the power supply was compromised to a level that I wasn't happy with.  I have some NOS 6B4G so the re-made amp, with separate power supply chassis, will use them.

 The amp was initially an EL34 kit from DIY Hifi Supply in Hong Kong using Chinese output transformers.  I hadn't planned on replacing them, due to the cost.  But then I thought, I'm pulling the whole thing apart and so if ever was the time to change output transformers, now is it.  Lundahl have a good reputation at reasonable prices so I bought a pair of LL1663 5k push-pull outputs.  All the metal-bashing and drilling ( the part I'm not much good at) are finished and the new parts installed.  Hopefully over this weekend I can fire it all up, without big bangs, and fine-tune the operating points.   :)

5k OPTs prob suit the 6B4s best.

Keep us posted.

 

I've used 2A3PP for the past few yrs.

 

Cheers, Owen

Dark Lantern blog - http://darklanternforowen.wordpress.com/

Silent Screamer Veteran

Silent Screamer

Posted
Posted
  On 17/03/2016 at 4:02 AM, lusk said:

I'm going to attempt a stacked layer with curved sides, l've always like the look of curved sided

speakers. This has taken awhile to design as l'm trying to minimise work when assembling.

It will have Scanspeak Beryllium and Audiotechnology drivers 6â€& 8â€, The 8â€is custom made for

ported extended bass shelf. Have also added in the walls a slots for filling with sand. 

 

These look very similar internally to the Sonus Faber Cremonas I had. Should be a good sounding combo.

awty Veteran

awty

Posted
Posted

Hi all

 

Just a few photos of a guitar speaker cab I just finished building for my son. Was going to be a father and son type project, which ended up being dad does most of the the work and son gets to use.

 

A bog standard cab using veneered chip board and MDF, vinyl cover, bit of trim and a pair of guitar speakers, one 10" and other 12" both 8 ohms, similar sensitivity, wired to run at 16 ohms (he picked the drivers.) 

 

Havent hooked it up to the amp (Marshal 100 watt tube) yet, but I think the neighbors will be hearing it very soon.

 

post-125771-0-07663200-1458371554_thumb.

 

post-125771-0-04271700-1458371560_thumb.

 

post-125771-0-09164500-1458371577_thumb.

 

post-125771-0-89755800-1458371582_thumb.

  • Like 9

awty Veteran

awty

Posted
Posted (edited)

Thanks everyone.

 

  On 21/03/2016 at 10:19 PM, Dirty_vinylpusher said:

@@awty

very tidy!
All built from scratch?
(Of course it is....silly me :rolleyes: )

Yep....well the wooden bits( rest was from speaker express), rebated the joints for extra strength. He didnt want any of my "usual ****", so pretty conventional, but I did sneak in some shellac covered oak with brass screws, goes well with the geetar.

The vinyl (elephant skin) was a pain, but got it on with a bit of help from the boy.......and its nice a LOAD!

 

 

 

Great job Mark, way better than a bought one.

Those flush mounted Allan key bolts and nuts are very handy.

Edited by awty
Guest

Guest

Posted
Posted
  On 21/03/2016 at 10:48 PM, markh3570 said:

I did pinch the "Muzak" logo off and old PA speaker....but otherwise hand-crafted ..thanks

Ah yes, no that comment was directed at awty.

Yours is clearly built from scratch.

:)

Guest

Guest

Posted
Posted
  On 21/03/2016 at 11:29 PM, awty said:

 

He didnt want any of my "usual ****"

.

How rude!

:ohmy:

Today's kids...I dunno

:rolleyes:

betocool Champion

betocool

Posted
Posted

I bought a pair of AC/DC 9V 450mA converters from Jaycar at 3$ each. I just needed to put them in an enclosure, would use them as a low power supply for breadboards and tests and such. What I didn't expect was for Jaycar to sell me a 9V supply that delivers 15V... but I can still work around it.

 

Voilá!

 

Had this lying around, makes servicing and upgrading pretty easy! Will change the main switch though sooner rather than later with a higher quality rocker switch, and put a 240V "On" lamp beside it. And I'm thinking of some panel meters to go with it as well.... we'll see.

 

post-142307-0-72654000-1458622055_thumb.

post-142307-0-65706800-1458622074_thumb.

post-142307-0-07593700-1458622095_thumb.

  • Like 1

betocool Champion

betocool

Posted
Posted
  On 19/03/2016 at 7:23 AM, awty said:

Hi all

 

Just a few photos of a guitar speaker cab I just finished building for my son. Was going to be a father and son type project, which ended up being dad does most of the the work and son gets to use.

 

A bog standard cab using veneered chip board and MDF, vinyl cover, bit of trim and a pair of guitar speakers, one 10" and other 12" both 8 ohms, similar sensitivity, wired to run at 16 ohms (he picked the drivers.) 

 

Havent hooked it up to the amp (Marshal 100 watt tube) yet, but I think the neighbors will be hearing it very soon.

 

attachicon.gifguitar cab c.JPG

 

attachicon.gifguitar cab e.JPG

 

attachicon.gifguitar cab d.JPG

 

attachicon.gifguitar cab a.JPG

 

On the same note...

 

post-142307-0-60978600-1458622963_thumb.

 

All DIY but the guitar. Celestion Greenback speakers, a digital effects processor on the top and delivers around 50W into 4 Ohms. Loud enough! To be honest, I started building all this around 2012 but finished it recently.

 

Couldn't be bothered with the vinyl cover, I like this.... to quote your son... "**** vintage look" :D

  • Like 3
awty Veteran

awty

Posted
Posted
  On 22/03/2016 at 5:05 AM, betocool said:

On the same note...

 

attachicon.gifIMG_5890.JPG

 

All DIY but the guitar. Celestion Greenback speakers, a digital effects processor on the top and delivers around 50W into 4 Ohms. Loud enough! To be honest, I started building all this around 2012 but finished it recently.

 

Couldn't be bothered with the vinyl cover, I like this.... to quote your son... "**** vintage look" :D

 

That looks great.betocool.

 

Dont think he would of minded that at all, just that I tend to get a little carried away sometimes. I went with the vinyl mainly to go with the Marshal amp......also the vinyl covers up all the not so great joints. :)

Guest

Guest

Posted
Posted

I think we can probably all agree on one thing when it comes to DIY, be it something like acg horns or a rusty box with salvaged dump drivers and cheap amps....

The moment you fire that thing up for the first time and everything works, beats anything money can buy.

I have built, re-purposed, modified and bastardized more things over the years than I care to remember.

Furniture, audio stuff, mechanical things, tools, you name it.

Even if they never get used, the satisfaction from seeing your ideas and hard work in action is one of the best feelings ever, regardless of what it is.

Keep the pics coming, guys.

Love this thread.

:love

Guest

Guest

Posted
Posted

"bastardized" 

@@Dirty_vinylpusher

haha, you are cool too man, love your work.

@@betocool, the project you posted with your DIY guitar and amp set up would have to be one of the best projects I have ever seen on the DIY thread, that would bring no end of pleasure, great job.

:thumb:  :popcorn:  :hiccup nearly as nice as @@awty 's TT, haha, which would sound awesome with those coaxial s that @@mwhouston made :D 

Best thread on SNA

Cheers  

Guest

Guest

Posted
Posted (edited)
  On 28/03/2016 at 6:48 AM, selectedgrub said:

Picture%2B528.jpg

I don't even know/care what that is.

But I love it (and everything you do)

:P

I want one.

What is it?

:unsure:

Guessing mid or tweeter or bass port

:)

Edited by Dirty_vinylpusher
Atlas Gouverneur Collaborator

Atlas Gouverneur

Posted
Posted
  On 03/04/2016 at 5:40 AM, mwhouston said:

Good sensitivity. Abart from one big dip the response is good.

 

Cheers. I will probably switch the current planar tweeter to a Fountek AMT and gain another 3 db and loose the dip that's seen at 15khz. The dips at 180 and 600hz are actually from room nodes which I will fix with the miniDSP.

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