Sun Audio SV-2a3 HK Clone - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th March 2010, 10:16 PM   #1
siqdiz is offline siqdiz  Netherlands
diyAudio Member
 
siqdiz's Avatar
 
Join Date: Apr 2009
Default Sun Audio SV-2a3 HK Clone

Yesterday I received my latest addition to my SET collection, a eBay hong-kong SUN SV-2A3 clone. The amplifier was purchased through eBay end of January and shipped to Holland with surface mail. The amplifier was bomb-proof packaged, a big thumbs up for the seller.

Before powering the device up I opened it up to check the internals, it's nice to see grounding and a fuse. I also removed the transformer covers to check what's lurking underneath them . The transformers are not branded, but by the looks of them they are quite well produced. They have been painted with a bitumen like substance. I also like the fact that each transformer is in its own enclosure. The circuitboard is simple with the traces wide apart from eachother, the 2a3 tube sockets are ceramic. The other sockets are plastic. A nice touch is the bias points are reachable without opening the enclosure, they are located between the 2 2a3 tubes.

I never had a tube amplifier before with a tube rectifier so I wasn't sure what to expect. My speakers are ~95dB/w horns. After the amplifier was turned on I put my ear against the speaker to find out if there is any humm. During the first few minutes there was a little humm/hiss, but after about 3 minutes the speakers were dead silent. Also the power transformer isn't vibrating.

It's way too soon to make any comments on the sound quality of the device; i've been watching TV with the 2a3 amplifier, sounds good. Comparing to my Sweet Peach FU50 amp, the bass doesn't go as deep, but this is just an early observation. Once the tubes are burned in I can do a full review on the sound.

The tubes:

2x Shuguang 2a3b tubes
2x 6N8P pre tubes
1x 5Z3P rectifier tube.
  Reply With Quote
Old 16th March 2010, 10:17 PM   #2
siqdiz is offline siqdiz  Netherlands
diyAudio Member
 
siqdiz's Avatar
 
Join Date: Apr 2009
reserved for photos.
Attached Images
File Type: jpg DSC01191_rescale.JPG (948.4 KB, 1280 views)
File Type: jpg DSC01190_rescale.jpg (692.4 KB, 1046 views)
File Type: jpg DSC01189_rescale.JPG (901.5 KB, 981 views)
File Type: jpg DSC01186_resize.jpg (783.8 KB, 940 views)

Last edited by siqdiz; 16th March 2010 at 10:33 PM.
  Reply With Quote
Old 19th March 2010, 10:32 AM   #3
diyAudio Member
 
Join Date: Jun 2005
Location: Shizuoka(has got Mt.Fuji)
Hello Mr Siqdiz. I have listend to a SV-2A3 at Hino company (ground floor of Sun audio)in Akihabara in Japan. the SV-2A3 letted me listen to brilliant piano sound thru an ALTEC(coaxitial 10inch undefenetly). I like direct heating triode amps(like 2a3 , 300b , 211).I have 300B SET(12AX7+6BQ5 drive) (?????????/JB 300B ver.3/???????? ??????) I can listen to the richest mid low(tone)sound thru this 300B(JB-300b) But I think that 300B can hardly win against 2A3 SET on Violin or flute sound(high tone).What do you think about that?
  Reply With Quote
Old 19th March 2010, 12:09 PM   #4
diyAudio Member
 
Join Date: Jun 2009
Location: Berlin
That's a great looking amplifier. How much did you pay, if you don't mind my asking? I'll be looking forward to you impressions.
  Reply With Quote
Old 20th March 2010, 02:00 AM   #5
diyAudio Member
 
Join Date: Jun 2005
Location: Shizuoka(has got Mt.Fuji)
This Jewelry Box 300B is US $ 1,100.( tubeless model is about $780 ?????????/???????? ?????? ) This amp makes mid,low ranges richness sound.(with a lot of 2nd harmonic distortion) The high range(Violin Flute) is with poor 2nd harmonic distortion.(but clear) But right hand of the piano is very very beautiful (full harmonic distortion). I like 2A3SET better than 300BSET about violin, flute or harpsichord.
  Reply With Quote
Old 20th March 2010, 01:39 PM   #6
kmtang is offline kmtang  Canada
diyAudio Member
 
kmtang's Avatar
 
Join Date: Nov 2004
Location: Vancouver
If you want to get good sounding amp, don't waste only with this. The quality of the components such as power/output transformers, resistors and capacitors are very important. To upgrade and modify the amp, it would cost about the same like builidng one.

Save the money and build a really nice one with good quality components.

JOhnny
  Reply With Quote
Old 21st March 2010, 08:28 PM   #7
siqdiz is offline siqdiz  Netherlands
diyAudio Member
 
siqdiz's Avatar
 
Join Date: Apr 2009
Quote:
Originally Posted by harakiri View Post
Hello Mr Siqdiz. I have listend to a SV-2A3 at Hino company (ground floor of Sun audio)in Akihabara in Japan. the SV-2A3 letted me listen to brilliant piano sound thru an ALTEC(coaxitial 10inch undefenetly). I like direct heating triode amps(like 2a3 , 300b , 211).I have 300B SET(12AX7+6BQ5 drive) (?????????/JB 300B ver.3/???????? ??????) I can listen to the richest mid low(tone)sound thru this 300B(JB-300b) But I think that 300B can hardly win against 2A3 SET on Violin or flute sound(high tone).What do you think about that?
This is the first DHT amp I've owned, I can only cross-reference against a Mengyue EL84 push-pull and a Sweet Peach FU50 SET. I've put around 10 hours on the 2a3 tubes now, when I've put around 100 hours in them it's time for a proper comparison against my other amps. Initial impressions are pretty good, although the FU50 SET wins in the bass department hands down. Again, only after a good amount of hours I'll compare the 2.

Quote:
Originally Posted by bigjppop View Post
That's a great looking amplifier. How much did you pay, if you don't mind my asking? I'll be looking forward to you impressions.
418 dollar excluding airmail, VAT and custom duties. Surface mail is free if you have the time to wait 2 months.

Quote:
Originally Posted by harakiri View Post
This Jewelry Box 300B is US $ 1,100.( tubeless model is about $780 ?????????/???????? ?????? ) This amp makes mid,low ranges richness sound.(with a lot of 2nd harmonic distortion) The high range(Violin Flute) is with poor 2nd harmonic distortion.(but clear) But right hand of the piano is very very beautiful (full harmonic distortion). I like 2A3SET better than 300BSET about violin, flute or harpsichord.
I listen all kinds of music, classic / electronic music / jazz / etc. I even watch movies with my amp. For me an amplifier needs to perform good in all those genres.

Quote:
Originally Posted by kmtang View Post
If you want to get good sounding amp, don't waste only with this. The quality of the components such as power/output transformers, resistors and capacitors are very important. To upgrade and modify the amp, it would cost about the same like builidng one.

Save the money and build a really nice one with good quality components.

JOhnny
You've had this amplifier too?

Last edited by siqdiz; 21st March 2010 at 08:34 PM.
  Reply With Quote
Old 21st March 2010, 11:20 PM   #8
ksporry is offline ksporry  China
diyAudio Member
 
Join Date: Jan 2010
Location: Shanghai
Just a suggestion, if you have multi way speakers, why not biamp? Use low tone suitable amps for low drivers (eg 300b set for bass/low) and maybe 2a3set for mid/high tones? Doesn't work with full range drivers ofcourse...
  Reply With Quote
Old 21st March 2010, 11:30 PM   #9
siqdiz is offline siqdiz  Netherlands
diyAudio Member
 
siqdiz's Avatar
 
Join Date: Apr 2009
I'm running full range horn speakers ( Das Viech with SICA 426 drivers ), they have no usable output below 50/55 hz. Soon I will be looking into designing stereo subwoofers for 30-60 hz, this will fill the bottom gap.
  Reply With Quote
Old 22nd March 2010, 12:18 AM   #10
diyAudio Member
 
Join Date: Mar 2010
Default Hi

Congratulationson yr new "Sun Audio" amp.

I own the same since a year or two.

The power transformers are the "Bez" kind, like sold on DIY Audio... Check if yours is marked 220 v or 240. If it turns out to be 220, looks like you'll be running a hot amp! (or, at least power transformer!)

Second; get rid of the filter-caps in the power supply; mine was fitted with a 400v rated 40mf number, the second one turned out to be a 500v 80 mf!
I replaced these with a single can cap rated 500v 2x47mf (exactly like the Sun).
The difference was amazing!

Then get rid of the volume-pot and get hold of an Alps type (50klog blue).

Alltogether, I am very happy with this baby!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sun Audio SV-300B MKII DIY blackjack2 Tubes / Valves 13 19th June 2014 05:13 PM
Sun Audio SV-2A3 wmy45 Tubes / Valves 3 12th September 2008 07:03 AM
Help: Sun Audio Kits where from? EIFL, ELEX, Sun Audio? Gaga Tubes / Valves 2 31st March 2006 01:51 PM
Short and sweet review of Sun Audio SV-300BE KT Tubes / Valves 0 28th January 2006 02:07 AM
Building a Sun Audio sv 300b Mk II clone doug_olitsky Tubes / Valves 6 25th December 2004 12:39 AM


New To Site? Need Help?

All times are GMT. The time now is 12:41 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2