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A New Hybrid from Indeed Hi-Fi Labs: does this look fun? - Page 19

post #271 of 355
1/7/10 at 5:15pm
yeah, I didn't have a whole lot of time listening to the amp before I started messing with things.

Also I really try my best to remain objective and not fool myself I am hearing differences when I'm not. I also just like good quality components in my equipment even if I can't detect huge changes (within reason of course, I don't buy into silver solder, power cables, or crazy expensive boutique passive components or any nonsense).

The philips BC cap is pretty good quality so I am happy with it there, but in a week or so I may change it for a Nichicon KZ 4700uF just cuz

I think tube rolling will result in the most notable changes, but I'm a bit strapped for cash after Xmas, and my mother's Bday was today as well...so I don't really feel like shelling out for tube after tube I would like one of those Philips Jan 6922 to play with though...
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post #272 of 355
1/8/10 at 3:08am
so far ive listed some tube been used by headfiers to roll the tube amp..

1. mullard
2. jan-sylvania

anything else? can anyone put their impression of each tube stated on the list above?

so any newbie or newcomers could easily identify or pick their favorite tube..
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post #273 of 355
1/8/10 at 3:53pm
Quote:
Originally Posted by i_djoel2000 View Post
so far ive listed some tube been used by headfiers to roll the tube amp..

1. mullard
2. jan-sylvania

anything else? can anyone put their impression of each tube stated on the list above?

so any newbie or newcomers could easily identify or pick their favorite tube..
It's just not that simple.

Each brand (i.e. Mullard, Amperex, Telefunken, etc.) has multiple tube types (i.e. 6dj8, 6922, 2492, ecc88, e88cc, etc) that will fit in this amp, and multiple series (i.e. different getters, labels, date codes, etc.) of those types. You must have an idea of the different labels, logos, getters and such that distinguish each tube. This isn't a true taxonomy by any stretch of the imagination, but it's how I've tried to suss it out. You will get confused probably, but keep reading and try to sort it all out. Try one type at a time...

My best advice is for you to Google some of the different types and start reading on ALL the sites that you can find. After you know what to look for, the fun part is finding a particular type and series from a particular brand that you can actually afford and acquiring it.

Time for you to study...
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post #274 of 355
1/9/10 at 2:45am
Quote:
Originally Posted by Judge Buff View Post
It's just not that simple.

Each brand (i.e. Mullard, Amperex, Telefunken, etc.) has multiple tube types (i.e. 6dj8, 6922, 2492, ecc88, e88cc, etc) that will fit in this amp, and multiple series (i.e. different getters, labels, date codes, etc.) of those types. You must have an idea of the different labels, logos, getters and such that distinguish each tube. This isn't a true taxonomy by any stretch of the imagination, but it's how I've tried to suss it out. You will get confused probably, but keep reading and try to sort it all out. Try one type at a time...

My best advice is for you to Google some of the different types and start reading on ALL the sites that you can find. After you know what to look for, the fun part is finding a particular type and series from a particular brand that you can actually afford and acquiring it.

Time for you to study...
i see..

anyway, im still waiting for your caps modding.hehe

please share your mod improvement here after it's done
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post #275 of 355
1/9/10 at 3:35pm
Quote:
Originally Posted by i_djoel2000 View Post
i see..

anyway, im still waiting for your caps modding.hehe

please share your mod improvement here after it's done
I hoped to get it done this coming week, but I am going to reorder a different set of output caps. Gurusan went with the Nichicon ES and nerd1949 went with Nichicon KZs... both great caps. I decided to shift to Elna's best audio electros, the Silmic II. I think I will take after each of them though and use 16V (gurusan) 470uf (nerd1949) caps. I'm getting the 25V too for a choice.

I'm also going to try and get the electronics lab and students at a tech school to do before and after comparisons, so I can have some objective data to report. I'm not promising anything, but I'm going to try to do this.
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post #276 of 355
1/14/10 at 9:25pm
I got my Elna Silmic IIs (16VDC 470uf) in the mail yesterday afternoon. I got antsy today and replaced both of the 1000uf caps. Sorry about not doing the analysis. I couldn't get to the electronics lab until late next week, due to work issues. Old guys get "wild hairs," too.

If anything changed initially it would be that the sound became more refined and smoother; especially in the upper mids and trebles. They had more of an edge with the old Elnas, especially with 6dj8s. I'll cook them for a while and report back.

I may replace the PS cap with a 4700uf KZ, like gurusan did, tomorrow. I may try to post some pics when I'm finished, but it's not like I'm hanging components all over the pcb like some folks (read gurusan) have done. Lol
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post #277 of 355
1/17/10 at 11:55am
Quote:
Originally Posted by Judge Buff View Post
I got my Elna Silmic IIs (16VDC 470uf) in the mail yesterday afternoon. I got antsy today and replaced both of the 1000uf caps. Sorry about not doing the analysis. I couldn't get to the electronics lab until late next week, due to work issues. Old guys get "wild hairs," too.

If anything changed initially it would be that the sound became more refined and smoother; especially in the upper mids and trebles. They had more of an edge with the old Elnas, especially with 6dj8s. I'll cook them for a while and report back.

I may replace the PS cap with a 4700uf KZ, like gurusan did, tomorrow. I may try to post some pics when I'm finished, but it's not like I'm hanging components all over the pcb like some folks (read gurusan) have done. Lol
nice report buff..

waiting for the in-depth review
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post #278 of 355
1/17/10 at 2:41pm
Hey Folks, the real action is taking place over on the Bravo thread. Due to some in-depth analysis from a few people with more knowledge than I'll ever have, I'm reswapping the 16V caps and changing out the pots. As soon as they get here, that is.

I've already swapped out the PS cap with the 4700uf and the amp is mega smooth and meaty with a great Amperex 6dj8 that's essentially a Bugle Boy, but has an orange and white label. Good stuff... Check out the Bravo thread!
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post #279 of 355
1/18/10 at 2:56pm
If you like more bass, switch to 2x 4700uf, but 35 V, 25V for 24V source is bad imo, I'm used to this value from my previous build of CMOY, now there's plenty of bass (for some too much, but it's not muddy) even on 250 ohm headphones, such as on my BeyerDynamic DT-990 PRO, there's enough volume, now it's driven properly, but the mids are kind of recessed, what is typical for those headphones. I just bought Amperex ecc88 on ebay, so I'm looking forward to test it and review it. it's a nice little amp, but tube can improve it.

I also installed small polypropylene caps parallel with other caps on the bottom, but I can't tell you sonic difference and installed bigger passive coolers.. Damn, this thing is hot. A class amp, you know.
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post #280 of 355
1/18/10 at 3:12pm
The problem is space, how do you fit 2 x 4700uF 35V caps?
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post #281 of 355
1/18/10 at 3:20pm
Quote:
Originally Posted by gurusan View Post
The problem is space, how do you fit 2 x 4700uF 35V caps?
You're totally right, there's not enough space. I cut a hole in that plastic for one cap and second cap is just next to it. It's not looking so cute anymore, I know , but it's about the sound. I'll post some photos as soon as I find my cable from mobile camera
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post #282 of 355
1/18/10 at 4:00pm
actually I've just fitted a second 4700uF cap and you are right, it has improved the bass I put it along the underside so will just elevate the PCB a bit more with some spacers.

I also put .1uF film caps on the LM317 outputs. Will take pics in a bit.

And why did you upgrade the heatsinks? What fits? I think it's an unnecessary upgrade as the IRF630N is good for up to 175C but it certainly doesn't hurt.
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post #283 of 355
1/18/10 at 4:35pm
Photos as I promised:


I'm looking forward for your pics of modding

Those heatsinks are just temporary there, I'm thinking of changing the position of them. The reason to have it are actually condensers. The more heat on them, the shorter life, and when more heat is on resistors, there's also more noise, however, I don't think it's so audible. It's about life time and reliability. With default heatsinks the components don't have life longer than 2 years when regularly used I suspect.
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post #284 of 355
1/18/10 at 5:12pm
good job!
Actually upgrading the cooling would allow me to recase the amp in something nicer. I will be building a grubDAC soon as the PCB comes and maybe I will case it along with that for a nice all-in 1 solution
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post #285 of 355
1/18/10 at 5:18pm
pics of my mods:


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