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PostPosted: 30 May 2013, 18:13 
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Arthurdent510 wrote:
And that actually may be my problem... being the newbie that I am, I assumed that the 2 aa's were all it needed, but after looking at it more it looks like I need to run 2 9v's in series and feed it 18v?

Sorry I had a little laugh at your expense. Yes you need 18V (2X9V). This is the HT or better called the B+ in this case. BE WARNED these amps click loudly when turned on. Turn it on with your headphones off your head. Once turned on they are quiet. Also when turning off remove your headphones.

You may need to balance the volume, left to right. Generally if the trim pots are in the same position they are reasonably well balanced. I use central spoken voice and pink noise to get the balance perfect for my phones.

Keep us informed.

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Projects: "Grace" - Psvane 6SN7-SE Globe preamp | | "VoXUno" - Single driver MarkAudio 12P speaker | | "Lagoon Take 2" - Single stage tube preamp | Website: retro-thermionic


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PostPosted: 30 May 2013, 19:52 
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Heh, that's ok, I probably deserved that one... on a good note, I hooked a couple 9v's in and it works :-) Just need to get it in a box now....


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PostPosted: 14 Jun 2013, 15:51 
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So I thought I would post an update, I finally got the box for it done and I think it came out pretty good. Sounds good too :-)

Image

Image


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PostPosted: 14 Jun 2013, 16:54 
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Arthurdent510 wrote:
So I thought I would post an update, I finally got the box for it done and I think it came out pretty good. Sounds good too :-)

Image

Image

Looks excellent. Very nice wooden box and you have kept a metal shell for shielding. Good work and looks very custom.

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Projects: "Grace" - Psvane 6SN7-SE Globe preamp | | "VoXUno" - Single driver MarkAudio 12P speaker | | "Lagoon Take 2" - Single stage tube preamp | Website: retro-thermionic


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PostPosted: 04 Jul 2013, 23:17 
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I just purchased this amp. What modding options are there (if any)? I have read through this thread, and it seems like it might be a little underpowered for my modded Fostex t50rp (they are orthos, so pretty hard to drive).


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PostPosted: 05 Jul 2013, 09:14 
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I will assume you got a K272C? I would use better Rs and Cs for start. Think about he hookup wire. I like write-wrap but there is other alternatives.

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Projects: "Grace" - Psvane 6SN7-SE Globe preamp | | "VoXUno" - Single driver MarkAudio 12P speaker | | "Lagoon Take 2" - Single stage tube preamp | Website: retro-thermionic


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PostPosted: 05 Jul 2013, 11:43 
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mwhouston wrote:
I will assume you got a K272C? I would use better Rs and Cs for start. Think about he hookup wire. I like write-wrap but there is other alternatives.


Thanks for the reply, and yes I did get the K272C. What is the best place to source better resistors and caps? Regarding wire, what gauge should I use? I also noticed silver wire/solder being thrown around--does that make a difference?

I am pretty new to DIY audio, so thanks for all the help.


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PostPosted: 05 Jul 2013, 19:15 
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Amperex wrote:
mwhouston wrote:
I will assume you got a K272C? I would use better Rs and Cs for start. Think about he hookup wire. I like write-wrap but there is other alternatives.


Thanks for the reply, and yes I did get the K272C. What is the best place to source better resistors and caps? Regarding wire, what gauge should I use? I also noticed silver wire/solder being thrown around--does that make a difference?

I am pretty new to DIY audio, so thanks for all the help.

The solder I use is WBT 4% silver solder. If you can't get wire-wrap wire for hookup try to get thin solid copper. A high grade copper wire would be best. Luckily I can get better caps and Rs from my local electronics store where I work. I can't suggest a place which is good for you. The K272C is great. I was listening to one of mine last night. Most enjoyable.

_________________
Projects: "Grace" - Psvane 6SN7-SE Globe preamp | | "VoXUno" - Single driver MarkAudio 12P speaker | | "Lagoon Take 2" - Single stage tube preamp | Website: retro-thermionic


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PostPosted: 26 Jul 2013, 12:04 
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mwhouston wrote:
Amperex wrote:
mwhouston wrote:
I will assume you got a K272C? I would use better Rs and Cs for start. Think about he hookup wire. I like write-wrap but there is other alternatives.


Thanks for the reply, and yes I did get the K272C. What is the best place to source better resistors and caps? Regarding wire, what gauge should I use? I also noticed silver wire/solder being thrown around--does that make a difference?

I am pretty new to DIY audio, so thanks for all the help.

The solder I use is WBT 4% silver solder. If you can't get wire-wrap wire for hookup try to get thin solid copper. A high grade copper wire would be best. Luckily I can get better caps and Rs from my local electronics store where I work. I can't suggest a place which is good for you. The K272C is great. I was listening to one of mine last night. Most enjoyable.


I quickly threw the kit together to make sure that it works--and it does! Where do I have to put in a pot for volume control? I want to use it as a headphone amp.


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PostPosted: 26 Jul 2013, 20:12 
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You can put in a pot where the trimmers are. Remove the trimmers. I leave the trimmers in to balance the channels and use the vol. control on my player (Cowon) to control volume level. If you can avoid a pot do.

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Projects: "Grace" - Psvane 6SN7-SE Globe preamp | | "VoXUno" - Single driver MarkAudio 12P speaker | | "Lagoon Take 2" - Single stage tube preamp | Website: retro-thermionic


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