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Valve/Tube DIY Amplifier and Enclosure Recommendations

post #1 of 15
Thread Starter 

Hello, all. I have been reading these forums for countless hours within the past week, and I finally had to join. I'd like to start off by saying I am a long-time electronics hobbyist (on and off, when I have time) with a terrible habit of either never finishing projects, or finishing them and never putting them to use because of a lack of proper housing/enclosure (or lack of time for that matter).

 

I will be away from my home for at least a year or two, and as music is an important part of my leisure, I've decided to invest in a fairly decent pair of headphones and amplifier. Bringing most of my hi-fi with me is out of the question because of the size and weight, and since I will be living in a flat/apartment on a nocturnal schedule speakers are generally out of the question at the volumes I prefer (not to mention I have been preferring headphones more as of late, anyway). I have a lot of fairly excellent audio equipment, but have not had any experiences with more expensive reference phones. I've been auditioning a few recently and will probably end up settling with the DH 600s or 650s. I may also consider the Bayer 880s but leaning towards the Sennheiser models at this point.

 

From my readings within the past week, it seems as though buying a commercial amplifier in most cases is a 'waste of money' as a DIY solution for the same price will generally yield you a better end product (or a similar quality product for less). I'm leaning towards a valve amp (preferred) or at least a hybrid. That said, I've been reading up on the most common DIY builds, especially the ones recommended for the 6X0s, and the general consensus has been the Cavalli Audio projects (Bijou/SOHA II, EHHA) or some of the cheaper hybrid builds (m3/Millet/SS). If it helps, I listen to classical/jazz and some electronic music (IDM, downtempo, dnb) exclusively. I would say that my budget is about $150-$300 USD for now for this project.

 

I'd really like to build the Bijou, but it seems that if I buy the kit from glass jar audio ($200), add the transformer ($50), and an enclosure solution ($40-$70), I am already at my budget without having factored in shipping or other costs like switch/sockets/knobs etc, which will probably end up being at least $350-70 total.

 

Other than the Bijou, what would my next best alternative be? I may still fork up the money and go the Bijou route, but still keeping my options open.

 

As for enclosures, the Hammond ones I've seen around here look great. I think I will go with the HWCHAS series (http://www.hammondmfg.com/HWCHAS.htm) or the 1441 (http://www.hammondmfg.com/dwg20CWW.htm). What dimensions would be appropriate for the Bijou? Trying to keep it as small as possible without heat being a huge issue.

 

If anyone can suggest any other great looking enclosures (or good DIY/commercial valve amps), that would be appreciated too. I would like the enclosures to preferably be wooden or include wood in their design, but anything is fine).

 

Cheers


Edited by herro - 11/16/10 at 11:00pm
post #2 of 15

Have a look at the Minimax versin of the Millet Hybrid if your worried about casework - 

http://beezar.com/oscommerce2/catalog/product_info.php?cPath=37&products_id=125

post #3 of 15
Thread Starter 

Quote:

Originally Posted by Forte View Post

Have a look at the Minimax versin of the Millet Hybrid if your worried about casework - 

http://beezar.com/oscommerce2/catalog/product_info.php?cPath=37&products_id=125

 

This is probably one of my next choices if I don't do a cavalli build, but I don't really like the enclosure. If I decided to get a new enclosure to house this in, it would cost even more than an EHHA+enclosure, which from my readings is probably the better amp. I seems I could build an EHHA (sans switches/plugs) for the same price as the Minimax, so the EHHA is probably the better choice?
 

post #4 of 15
Thread Starter 

It turns out that the kit price for the EHHA kit does not include the powers supplies, so the cost for the Bijou + Transformer will be almost the same as an EHHA with power supplies. I'm leaning towards the Bijou even more now as I would rather have a pure tube solution, unless the EHHA rev A proves significantly cheaper (at least -$70).

 

Can someone lead me in the right direction regarding the appropriate enclosure size for housing the bijou (specifically from the enclosures I mentioned or a general measurement).

 

Thanks


Edited by herro - 11/17/10 at 8:00am
post #5 of 15

Jeff ( glass jar audio_ is working on kits for the new EHHA RevA that comes with the PSU on the same board so you won't need an amb S22 power supply.

 

Alternatively, you can just buy the boards from him, download the BOM for  the RevA from Cavalli Audio and put in a mouser order.

post #6 of 15
Thread Starter 
Quote:
Originally Posted by sachu View Post

Jeff ( glass jar audio_ is working on kits for the new EHHA RevA that comes with the PSU on the same board so you won't need an amb S22 power supply.

 

Alternatively, you can just buy the boards from him, download the BOM for  the RevA from Cavalli Audio and put in a mouser order.



I've been corresponding with him via email. I think I am going to get the Bijou if I sort out an enclosure solution soon (size etc), but I may wait for the RevA kits before I choose.

 

Edit: Also have been looking at the par metal site (http://www.par-metal.com/product-ttp-20series.php) in addition to the two hammond enclosures. I think I want to internalise the transformer but have the tubes external.


Edited by herro - 11/17/10 at 8:51am
post #7 of 15

If you choice high impedance phones, go for true tube amp. I can recommend Optimized Morgan Jones Amplifier:

http://gilmore2.chem.northwestern.edu/projects/showfile.php?file=cmoy5_prj.htm

 

This is one of the best I am heard with HD580. Take Hammond wood/aluminum enclosure, find good transformer with cower, and build it point to point.

 

Other good option is Aikido by John Broski

post #8 of 15
Thread Starter 

I'm going through the whole ~250 pages of the bijou thread tonight for some tips/suggestions with building...I think that is what I am going to end up getting.

post #9 of 15
Thread Starter 

I'm also considering doing a γ2 DAC build as well (mostly going to be using USB input). Also considering grubdac or aliendac since I will mainly be using USB, but the other inputs look appealing if I ever got around to using them in the future. I was thinking of building the amp and dac in the same enclosure with unmodified circuits, the only 'bridging' between them would be a switch to select between the amp's analogue inputs (i.e. analogue source -> amp) and the DACs stereo output (dac's input -> dac -> amp). The only digital sources I have are CD deck (which I do not need a replacement DAC for) and my computer, so I reckon the only time I would use the DAC is in conjunction with the amp, anyway.


Edited by herro - 11/21/10 at 2:26pm
post #10 of 15

For the DAC, Keep in mind that the grubDAC and gamma2 are on completely different levels in both cost, complexity, and specifications. Also, I don't know about the minimax, but the starving student has been known to damage DAC's. Just a heads-up.

post #11 of 15
Quote:
Originally Posted by dorkvader View Post

For the DAC, Keep in mind that the grubDAC and gamma2 are on completely different levels in both cost, complexity, and specifications. Also, I don't know about the minimax, but the starving student has been known to damage DAC's. Just a heads-up.


The MiniMAX has no such issue with DACs.  Neither do the Millett Hybrid, the Millett Hybrid MAX, or the Millett Hybrid MOSFET-MAX.  All I've ever used with any of those amps are Alien, Bantam, and GrubDACs.  The Starving Student Millett Hybrid is totally unique in its history of damaging direct-output DACs.

 

The unique switcher power supply is the cause of the issue with the Starving Student. 


Edited by tomb - 11/22/10 at 2:40pm
post #12 of 15


 

Quote:
Originally Posted by tomb View Post
The unique switcher power supply is the cause of the issue with the Starving Student. 


Can you elaborate on this?  I've not heard much about this, but at the same time I am using a linear regulated PSU for my SSMH.  My DACs have been fine (including my Alien), so I'm interested to hear about this as I was going to switch to the switcher PSU to do some more work on the linear PSU (mostly recasing).  I'll just switch amps, if there is an issue with the PSU.

 

Edit: nevermind.  I think I found the info.  Wow, it's been over a year since I last did any DIY audio stuff....


Edited by holland - 11/22/10 at 3:14pm
post #13 of 15
Thread Starter 

Just a little update: My HD 650s are on their way (due in the next day or two!), and I decided on the Bijou (kit paid for and waiting to be shipped). I've started using the project manager on mouser getting together all my hardware/accessories I'd need. Still deciding on an enclosure and DAC though.

 

Initially I was going to build a complete gamma-1 and gamma-2, and put it in the same enclosure as the Bijou. I don't imagine using spdif or optical inputs anytime within the next year or so, but I figure if I'm going to permanently house it in the Bijou I might as well shell out a little bit extra to make it fully-featured for future use.

 

However, since I will be using the USB input 99% of the time for the next year or so, I was going to compromise and settle for the grubdac and perhaps build the y1/y2 later on.

 

A full y1 build for me with mouser is ~$115. A full y2 build is ~$75, so with shipping and the boards from amb, ~$260 total (not including enclosure or plates since it would be inside the amp enclosure). A full external build would be about $310 with the amb plates. A grubdac is about $35+shipping for an internal build or $50 + shipping for the DAC + external housing and cabling if I wanted. I guess I could also sell it if I decided to upgrade

 

Is the y2 better enough to justify going way over my budget now rather than (potentially) spending more later at my discretion? Perhaps I should just scrap the idea of housing the DAC and amp in the same enclosure, to make the future upgrade of a dac easier? Maybe even an intermediate DIY DAC project in between these price ranges?


Edited by herro - 11/30/10 at 11:54am
post #14 of 15
Thread Starter 

I'm also trying to post a classified to see if I could pick up a cheap y2...but when I try to create one it is saying 'You are over your limit for posting this forum. Please check back later.'.

 

Post count too low perhaps?

post #15 of 15
Thread Starter 

Finally got my hands on my headphones today. Happy that one of my concerns was the comfort, but they feel a lot more comfortable than the ones I auditioned. As I am still waiting for my bijou kit in the post I have no decent amplification, and the source is just my MacBook analogue out. I can hear a definite 'muffled/veiled' sound (as if I'm not really there), even though these cans and their sound are still better than any other I've owned personally. I'm still impressed.

 

I had a $10 portable amp circuit I built years ago for an iPod (powered off one AAA, based off of a FiiO product), and even though this amp is probably one of the cheapest builds possible, the difference between the 650s unamped and amped with this pathetic thing was still huge, so I can't wait to finally get my amp build completed. Already hearing things in my music that I was only able to hear with my 40-year-old analogue setup back at the house.

 

Not to mention I also decided I'm going to shell out some more cash on a y2 dac, so I can't wait to hear the difference.

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