1.5W+1.5W 單端無輸出牛膽後級

AP,

可以用 Digital Camera 試一吓, 未必唔得.

Dear AP,

Nice work! You indeed invested a lot in this one.

Your amp should sound OPEN and AIRY as you used the Copper Tube caps. The BASS should be much more punchy and solid than before as well.

Is that how you feel about it now?

CAT

Yes, the Copper Tube Jensens need around 200 hours to fully run in.

But you SHOULD to able to tell the difference once you replace them with the old stuffs.

So which 2A3 you want to build? PP or SE?

CAT

Dear AP,

You want to take mine? Ha.ha.. I can sell you at cost only.

Thinking of building a 300B ...

CAT

Yes, I am using RCAs.

I have VT-95 Black Plates, USN CRC ones as well. All Black Plates.

I also have Type 45 from various manufacturers.

Yes, I got all the tubes from eBay. Just don't be too anxious to get them. You have to wait for the opportunity. I test the tubes after they arrive with my own tester.

Hey, I am serious. I have thought of selling mine. Any interest?

CAT

Dear Andy,

Yeah, I know I can use the XE-20S and the Jensens back. If nobody wants the 2A3, I may as well keep it to do the AB comparison with the 300B I am going to build.

I went to brother Yuen's place today and order the major parts like the Case, OPTs, PT, etc. and asked them to drill the holes for me as well. However, there is no power transformer available and I have to wait 2 weeks. Nice ... I can get my toys after my pay day.

:

Dear AP,

Well, it is not the 2A3 not powerful enough. I think the circuit I use has a lower gain than the original 6SN7 circuit. The Amp does sound good, even better than the Sun Audio 2A3 as told by some of my friends.

I am using a pair of Castle Conway 3 floor standing speakers. Their sensitivity is 91db at 1m.

On second thought, the tubes are still available at ebay but the Black Gate 100uf + 100uf .... if I sell the amp to you, I don't know where I can find another one of this ... ha... ha...

Have we met before? Maybe I take the amp to your place for an audition before we decide on anything, ha..ha.

CAT

WINDWSS,

I cannot post the 300B circuit here as the owner doesn't want it published openly. If you really need it, I can email it to you.

No, I haven't try the Audio Note Kit one circuit and I don't know anyone who had tried that circuit as well.

I got a friend who purchased a AN 300B two months ago. I bumped into him two days ago and asked him about the amp. Unfortunately, he has got much time to properly set it up yet. Else, I would like to go down to his place for an audition.

CAT

Sorry, typo.

My frined "hasn't" go enough time to set up his 300B properly.

Dear AP,

Do you want me to take the 2A3 to your place for a listening test?

CAT

Dear AP,

Please check PM

CAT

Oh, please PM me in R33 then. I can't find yours, ha.ha..

You can locate me in PASS DIY under 影音天地

Thank you