Sunday, 20th April 2014.


Posted on Sunday, 16th February 2014 by Auw Jimmy

This is a giant tube. With around 500 grams of weight, definitely this is a heavy weight class. It’s a Pentode with shadow grid to reduce the screen current – so we should call it a Hexode. Its filament rated at around 12.5V and 2.3A. At around 25W filament, it shouldn’t be that hot.

As shown below, the filament is on the center, from the top to bottom. The metal plate on the base seems used as heatsink. This tube is very sturdy in terms of the construction.

TelefunkenYL1260_2

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Posted on Sunday, 16th February 2014 by Auw Jimmy

This is quite common tube, 300B by Shuguang. Nothing really special, only white ceramic tube socket, gold plated pins, and carbonized nickel plate. Let’s see how interesting this tube when the filament is powered.

The perforated design is interesting than regular solid plate on most tube. But perforated design is not as beautiful as mesh one. We can see more glowing filament with a mesh plate type.

Shuguang300B_1

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Posted on Sunday, 16th February 2014 by Auw Jimmy

EIMAC tube is well known as high power (we are talking ‘K’ in Volts). The current requirement also quite heavy. But the best thing from them is they are beautiful with Thoriated Tungsten filament. I’m collecting some EIMAC tube. And as I have no plan to use them in my project (I have no guts to play in ‘kiloVolts’ area), then the best way to enjoy this EIMAC tube is by powering the filament up. Below is Power Tetrode EIMAC 8165 or 4-65A. It requires 6V and 3A power supply to power its filament. EIMAC4-65A_1 Read the rest of this entry…


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Posted on Sunday, 9th February 2014 by Auw Jimmy

I used to review a lot of stuff, including capacitor. But it comes upon a time when I have to be reviewed – I mean, my stuff. If you haven’t got any chance to understand this ‘No Name’ Capacitor stuff, feel free to review the journey below:

When I wrote a post asking for testing this capacitor few months ago, I got several dozens of emails. It seemed many were interested to try (and surprisingly I got a lot of silent reader who never commented but suddenly applied for testing the capacitor). Quite unfortunate due to the sample limitation (and also the price), I couldn’t fulfill all of the request. Only some who were considered qualified were chosen. By the way, I still received a lot of emails several months after I posted the ‘vacancy’. Some of my good friends also got privilege to test this special capacitor. One of them is Rob, from DHTRob.com. Rob has similarity with me. I would say: RGN, Tamura, and Black Gate WKz could describe our similarity. And surely he didn’t mine to borrow me his ears testing this capacitor and share his comment on his website here. Comparison between ‘No Name’ Capacitor and the legendary Black Gate WKz.

1-JimCaps-WKz

I believe Nichicon is not on the same league with this ‘No Name’ Capacitor, but what Rob says regarding the ‘no electrolytic signature’ and ‘no harshness’ are two keys that could describe the ‘No Name’ Capacitor sonic signature.

0-JimCapsDHTRob

 

 

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Posted on Thursday, 6th February 2014 by Auw Jimmy

This is indeed a nice F5T (F5 Turbo) PCB. Well designed one, good option and flexibility, and surely good quality fabrication.

Time to shop for the parts? ;)

F5T

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Posted on Thursday, 16th January 2014 by Auw Jimmy

A bit tough later these days to find a good reclock module. Somehow, I was interested to try this one: TCXO Module from D/A Mental (a bit strange name, huh?).

The specification is quite promising, like below:

  • Frequency : 22.5792MHz
  • Precision : 1ppm
  • Operating voltage : +3.3Vdc
  • Operating current : 25mA (MAX)
  • Output Waveform : TTL/CMOS
  • Duty cycle : 40/60%
  • Frequency stability Vs Temp : +/- 5ppm (0 ~ +50 C)
  • Phase noise : -135dBc/1KHz(10M)
  • Package : 20.4 x 12.8 x 7.5mm
  • Aging : +/- 2ppm/Yr.

So far I used to be a big fans of TentLabs for his clock module. But lately Guido is hard to be reached. So alternative option should be considered… I would be more than interested to compare this vs TentLabs, but unfortunately I only have 27 and 12 MHz clock from TentLabs, and they are not TCXO.

TCXO

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Posted on Sunday, 29th December 2013 by Auw Jimmy

Not really a DIY activity this one, but just a break with another hobby: photography!

I believe we are familiar with a lot of tubes, but sometime we never see the detail what’s inside. From this moment, I will start to take picture of several tubes that I got on hand, in detail. Probably some will have the heater powered – to give sexier view. Thank to my micro lens, Sigma 150mm/2.8. I believe this is one of my best investment (and upgrade) so far for macro related activity.

We start with my favorite Russian tube: 6N6P or probably we are familiar with its other name: ECC99. It has gold grid, don’t know if it’s a real gold or just gold color.

1 - 6N6P - Grid

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Posted on Thursday, 26th December 2013 by Auw Jimmy

After first part here, I think it’s time to experiment more with this SPDIF Transformer. What could be worst than potting it into a custom enclosure? Nanana, I can’t even imagine…

Below is the final result: The potted transformer vs the original one. The size, ugh, a bit big – bigger to be honest.

11-Potted

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Posted on Wednesday, 25th December 2013 by Auw Jimmy

Scientific Conversion SPDIF Transformer is quite unique. The appearance is 8-pins SMD, but the footprint is nowhere on the 8-pins SMD one. I have tried BrownDog PCB to mount, but it just doesn’t fit (or I pick wrong PCB). But anyway,  I don’t think this will bring so much trouble for people like me (or us) who likes to tinker around.

So I cut a PCB into small size, and mount the transformer on the top of it. The output wires are 24 AWG UP-OCC wire which should be more than capable to do the job.

Below is the photo of the output side. Be noted that the two pins on the center are the ground wire. You can either float it or connect it to the ground.

0-Transformer

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Posted on Monday, 23rd December 2013 by Auw Jimmy

It has been a while since the last gathering (Bintaro XIII). So finally at December 21st, the 14th Bintaro gathering held again. You must be quite familiar with below setup, owned by Mr. Didik Wiryawan (the host): The giant DIY speaker, F4 power amplifier (along with big fan on the back), Aikido pre-amplifier, and NAD/CEC as source.

1-System

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Posted on Thursday, 31st October 2013 by Auw Jimmy

It’s almost perfect. Only need a final touch. Thanks for the great work of the manufacturer (which I can’t disclose now, but soon).

This final version has a solid silver leadout. It will not break easily because it’s a twisted wire. Very strong and solid, I have to admit. And also you will see a number to mark where is the input, output, positive, negative, etc.

JimCaps2

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Posted on Sunday, 27th October 2013 by Auw Jimmy

What a lazy Sunday! So I just play a bit with my Nikkor 105mm Micro lens to take picture of the new Nokia Lumia 1020, smartphone with Windows Phone 8.1 operating system. Camera wise, it has 41 MegaPixel camera and Carl Zeiss 6 elements lens (5 are plastic and the last one is glass). It has f/2.2, new Optical Image Stabilization (OIS) technology which whole optical assembly will move to compensate the unwanted camera movement, and also Xenon flash combined with focus assist LED light. What else?

Lumia1020_1

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About Some Audio Parts for Sale !!!