Author Topic: AMX Tube Products (Read 680443 times)

wanderlust · « **Reply #3810 on:** Mar 01, 2005 at 01:54 PM »

was in phasetron yest, saw several amps there, there was one particular PP that was already sold, priced at 38k ata that got my attention and that 16.5k amp..... wasnt able to audition them thought.

saw 2 ata din a power amps lang (without the volume pot). all were priced below 30k.

Jakob · « **Reply #3811 on:** Mar 01, 2005 at 07:05 PM »

sir, post some pictures please....

old_age · « **Reply #3812 on:** Mar 02, 2005 at 07:22 PM »

what i saw at phasetron were two integrated tube amps.... the EL34 25watts PP tube rectified at P21k only and the KT88 50watts PP ss rectified at P25k only ...sounds are unbeatable for its price....

wanderlust · « **Reply #3813 on:** Mar 03, 2005 at 04:36 PM »

sir, r u sure they are tube rectified?

kimpao · « **Reply #3814 on:** Mar 03, 2005 at 05:09 PM »

Quote from: wanderlust on Mar 03, 2005 at 04:36 PM

sir, r u sure they are tube rectified?

Aba bakit nagtatanong ito?

old_age · « **Reply #3815 on:** Mar 03, 2005 at 07:09 PM »

the sales people there told me that it was ss rectified. i personally spoke to Andrew on the cel, i was told that the KT88 amp is for all type of music.

wanderlust · « **Reply #3816 on:** Mar 04, 2005 at 02:42 PM »

my fault sir, didnt notice that it was only the 25 watter that is tube rectified, and the kt88 SS pala.... i did saw it to, and i have noticed na mukhang ala rectifier yong kt88............ sayang kung tube rec e2, it wud be a steal for its price

Quote from: new age

what i saw at phasetron were two integrated tube amps.... the EL34 25watts PP tube rectified at P21k only and the KT88 50watts PP ss rectified at P25k only ...both sound are unbeatable for its price....

master kim, just trying to clarify

kimpao · « **Reply #3817 on:** Mar 04, 2005 at 02:44 PM »

Quote from: wanderlust on Mar 04, 2005 at 02:42 PM

master kim, just trying to clarify

Charot!!!!!!.........

Ikaw pa!

wanderlust · « **Reply #3818 on:** Mar 04, 2005 at 03:12 PM »

totoo........... promise

AMXTube · « **Reply #3819 on:** Mar 04, 2005 at 06:02 PM »

For your appreciation and information:

Our new EL34 budget integrated amp that is coming out very soon , is equipped with an active line stage. It is no longer a power amp with a passive line stage preamp. This is code named: APOLLO 2The circuit topology is very different from the amplifiers we built before. The line stage preamp uses a 6NIP or may be upgraded to 6DJ8. The phase inverter topology uses the floating paraphase scheme, and the power supply uses both a tube rectifier and high speed diodes together.

The budget EL34 basic power amp , code named APOLLO 1 , has no volume control and will need a separate preamp to drive it to full power.

APOLLO 1 and 2 will also be available in premium models, fitted out with Auricaps, NOS driver tubes, JJ Filter capacitors, fully chrome plated chassis and transformer covers. Of course the price will be higher but will still affordable.

Also in the test lab is our new passive gain line preamp. It uses an inductor to increase the gain from 250mv (CD output) to 1 volt (power amp input) No tubes and no power requirement. Check this out soon. CHEERS!

john5479 · « **Reply #3820 on:** Mar 06, 2005 at 09:34 PM »

hintayin ko yang passive preamp sir

abj104 · « **Reply #3821 on:** Mar 06, 2005 at 10:19 PM »

mga bosing,
ano ba ibig sabihin ng ss rectified at tube rectified.
ano ba naitutulong nito?i'm beginning to read as much about the Tube and SS Amps because i'm planning to buy one. Ano bang magandang tube o kaya ss integrated amp?Budget is 25k only.
thanks!

levi · « **Reply #3822 on:** Mar 06, 2005 at 11:05 PM »

Amx,

Any chance you will have a parallel SET amp?

RU9 · « **Reply #3823 on:** Mar 07, 2005 at 07:17 AM »

Quote from: abj104

ano ba ibig sabihin ng ss rectified at tube rectified.
ano ba naitutulong nito?
thanks!

From the Net:

What's the difference between tube and solid state rectifiers?

The rectifier circuit in an amplifier converts the Alternating Current (AC) from the wall outlet to Direct Current (DC) required for operating the various circuits inside the amp. Originally, this conversion or "rectification" was accomplished using a vacuum tube rectifier, also known as a dual diode. Later with the advent of solid state technology, the rectification process was accomplished much more efficiently and less costly with silicon diodes. Besides the cost, one of the primary advantages of the silicon diode is its low voltage drop. Because of this characteristic, the solid state rectifier supply responds much more quickly to the increased current demand created when the amplifier is driven to full output. This gives the amplifier a tight , crisp and dynamic response. The tube rectifier exhibits a much higher internal voltage drop, which in turn causes the power supply voltage to sag when the amplifier is driven hard. We experience this sag as a natural sounding compression, which seems to give the amp a breathing, bouncy quality. In addition the tone will appear to sound softer or more rounded with increased sustain. Today we find that both the tube and solid state rectifiers have a valid application in helping to enhance the personality of a given amplifier design.

RU9 · « **Reply #3824 on:** Mar 07, 2005 at 07:22 AM »

Quote from: AMXTube

Also in the test lab is our new passive gain line preamp. It uses an inductor to increase the gain from 250mv (CD output) to 1 volt (power amp input) No tubes and no power requirement.

Hi Andrew,

Please clarify, if this is passive, why the gain? Can this be matched with a CD player with an output of 2V. Is this compatible with amplifiers with an input sensitivity of 1volt.

Thanks.

Louie

JojoD818 · « **Reply #3825 on:** Mar 09, 2005 at 12:29 AM »

RU9,

I believe Andrew is pertaining to a transformer coupled passive preamp that uses a step-up transformer. Probably a multi-tapped transformer (TVC) or a fixed ratio type tranny fed by a pot. Sounds very good indeed.

Cheers

john5479 · « **Reply #3826 on:** Mar 09, 2005 at 01:57 AM »

i think this is the preamp my gainclone needs

AMXTube · « **Reply #3827 on:** Mar 09, 2005 at 09:23 AM »

Yes exactly, it is passive, it means no transistors, IC or tubes and no need to power up. But it has gain, by reason of electromagnetic induction or in short it has a small step up voltage transformer. How it works is it steps up the 150-300mv from your CD player to about 750mv- 1 volt so it can drive in inputs of a power amplifier. It sounded great witha solid state poweramplifier. But it needs some fixing in the response region. I hope to succeed in extending the frequency response.

Major difference of Solid State Rectifier versus Tube Rectifiers: As I have measured and observed.
Solid State Rectifier Tube Rectifiers

Lower over all cost More expensive of course
Not easily tweakable power supply Easy to tweak or "tube roll"
lower impedance, improves damping deeper bass Higher impedance lower damping softer bass character
More efficient Produces more heat for transformers
Can use high value capacitors for better dynamics Limited capacitor value, increase hum and noise
later clipping due to better voltage regulation Softer clipping but earlier onset due to sag of B+ at high

JojoD818 · « **Reply #3828 on:** Mar 09, 2005 at 11:35 AM »

Quote from: AMXTube on Mar 09, 2005 at 09:23 AM

Yes exactly, it is passive, it means no transistors, IC or tubes and no need to power up. But it has gain, by reason of electromagnetic induction or in short it has a small step up voltage transformer. How it works is it steps up the 150-300mv from your CD player to about 750mv- 1 volt so it can drive in inputs of a power amplifier. It sounded great witha solid state poweramplifier. But it needs some fixing in the response region. I hope to succeed in extending the frequency response.

Excellent choice sir Andrew! I made some experiments with those TVCs and AVCs some years ago, those Western Electric application sheets I read said that the core is the key to bandwidth and something like magnetic flux problems. Unfortunately those papers were lost when I changed address.

More power to you and good luck sir!

vvt-i · « **Reply #3829 on:** Mar 16, 2005 at 11:32 AM »

guys,

available na for auditioning ang budget tube amp(1 integrated tube rectified and 1 power amp solid sate rectified) sa phasetron. was able to listen to the push pull (4 x el34, 1 x 6n1p, 5u4gb, and 2 x 12au7 or 12ax7) pero sandali lang hooked up to klipsh speakers and denon cd player.

wala pang price pero im sure affordable ito.

vvt-i · « **Reply #3830 on:** Mar 16, 2005 at 11:35 AM »

AMXTube,

sent you pm.

kid · « **Reply #3831 on:** Mar 16, 2005 at 03:59 PM »

Jetok,

How was the sound? affordable din

sana mapadpad ako sa makati para ma audition yang budget amp

john5479 · « **Reply #3832 on:** Mar 16, 2005 at 08:09 PM »

the budget tube amp has 4 iterations: integrated and tube rectified, integrated and ss rectified, power amp ss rectified amd power amp tube rectified. 25w x 2 in ultralinear mode. sounded good with teh klipsch buy my audition was short as well.

H a n $ · « **Reply #3833 on:** Mar 17, 2005 at 03:39 AM »

Quote from: punk kid on Mar 16, 2005 at 03:59 PM

Jetok,

How was the sound? affordable din sana mapadpad ako sa makati para ma audition yang budget amp

Takbo na KID_lat.. este lipad pala..

kid · « **Reply #3834 on:** Mar 18, 2005 at 10:18 AM »

Zooom... Zooom... Zooom! this weekend

j_albert22 · « **Reply #3835 on:** Mar 21, 2005 at 07:33 AM »

like old time baka pwede ma HOME audition hehehe sino maglalakas loob ................................kc yong malakas loob ala D2 e

H a n $ · « **Reply #3836 on:** Mar 22, 2005 at 12:45 AM »

Quote from: j_albert22 on Mar 21, 2005 at 07:33 AM

like old time baka pwede ma HOME audition hehehe sino maglalakas loob ................................kc yong malakas loob ala D2 e

Hahahhahaa

Kaya mo yan

john5479 · « **Reply #3837 on:** Mar 22, 2005 at 01:01 AM »

ok yung build ng amp very hefty, ok din naman ung sound

Audioboy · « **Reply #3838 on:** Mar 22, 2005 at 10:10 AM »

Quote from: john5479 on Mar 16, 2005 at 08:09 PM

the budget tube amp has 4 iterations: integrated and tube rectified, integrated and ss rectified, power amp ss rectified amd power amp tube rectified. 25w x 2 in ultralinear mode. sounded good with teh klipsch buy my audition was short as well.

magkano power amp ss rectified?

j_albert22 · « **Reply #3839 on:** Mar 22, 2005 at 12:31 PM »

Quote from: hans adriane on Mar 22, 2005 at 12:45 AM

Hahahhahaa Kaya mo yan

pano ba ginawa mo

?