2A3 finally finished

我也想diy 1 部 2A3. 你剛好posted 所有info that I need.
容易 adjust 個 2A3 hum pot 嗎? 我未DIY 過直熱管.

Bong

I have a pair of Cain & Cain Abby (using Fostex drivers) speaker.  I wanna DIY an 2A3 amp to drive them.

I am planning to use AudioNote TRANS-144 and CHOKE-160. The CHOKE-160 is 10H, 125mA. Will this choke big enough?

Where did you get your BG 47/47? I couldn't find one.

I am debating to use 6SN7 or 6SL7. I prefer to use 6SL7  tubes since they are cheaper.

What do you think?

BOng

$2000HKD for 1 BG? Way too pricey !!!

I got some 45 tubes? Are they interchangeable with 2A3?

Where did you buy the A&B 100 Ohm hum pot?

THe 750R Ohm 20W resistors will be hard to find.

Bong

I found some 2W and 3W 100Ohm pots on Ebay for about USD 6.00. They are not A&B, but they look solid built.  I live in California.  Not sure how much the shipping would cost.

Bong

I am still in the process of planning.


I probably just get those 100 Ohm pot from Ebay.

For the 2A3's 100uf/160V cap, do I really need 160V cap? BG only have 100uf/100V. Have you measured the voltage there to check if it requires 160v cap?

I found some other OPT that might be better than the Audionote TRANS-144. They are Lundahl Transformers LL1664. They are C-core.
I have never heard of them before and I found some good review about their transformers.

Thanks,
Bong

The  Lundahl LL1664  Transformers is only USD $145.00. For a C core OPT, I think it's a very good deal. http://www.kandkaudio.com/

The other options I am considering are:

1) One Electron UBT-3: around USD 106.00
2) Hammond 1627SEA Output Transformer: around USD 110.00

It's hard to decide since I can't listen to them before buying.

In the previous posting, you mentioned
原因好簡單. 我得閒得滯 .... 將枝5U4G換了5V4...燒咗粒 Black Gate 100uf / 100V.
So you are using BG 100uf/100V?
Not 100uF/160V?

Bong

Currently, I am building an Audio Note Kit M3 preamp and a LS3/5A clone.
Maybe I will start working on this project in August.

So you have compared yours with a sv-2A3 kit, already? Which one do you think is better?  How is the OPT they use in the Sun Audio sv-2A3 kit? Not as good as Tango?

Bong

Hi Alfcat,
   You know what. I ended up ordering the kit from Sun Audio. Now I don't need to worry about the finding the chassis, OPT, and Power Trans. I just need to buy some good parts to replace all the stock parts.
Bong

Too Bad. I already paid la. Are those 2 OPT That bad?

Bong

HI AlfCat,
   I know a local tube collector selling NOS RCA 5691 for $40 USD each. It's about $320.00 HKD. Is the price ok?

Bong

Hi Alfcat,
  I am having problems to access my HifiFever messages from my office.

I asked her, she has only 1 of that tube. I will ask her how much.

Bong

Have you decided to build which 300B amp yet?
Mono block?
I spent too much money on HiFi gears  this month . My Wife will kill me, if she found out.

But I am so happy by just looking at the HiFi gears. Don't even need to turn them on.
Besides the Sun Audio sv-2A3, I also bought a 200W solid state power amp and a solid state pre amp. Just wanna try out solid state amp.

Bong

The transistor preamp I bought was not a kit.
It's Aragon 18K. I saw this on ebay.com and paid $310 USD for it. Planning to modify it with some Blackgate and Jensen caps.

I have a Marantz 7 kit too. I used A&B resistors, Auri Caps (for the 3.3uF) and Russian PIO caps (for the 0.033uf). It sounds very good.

My sister bought the sv-2a3 kit for me. The dealer in HK still have a couple kits. But they want to sell them for about 10,000 HKD each. It used to be HKD 6,800. I hope she will send it to me soon.

I will take of pictures of the projects I am working on.

Bong