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A Very Compact Hybrid Amp - Page 30

post #436 of 2213
Quote:
Originally Posted by nsx_23 View Post
Yes he does, and I'm wondering if should go for it at $12USD....
I've a Sylvania 12BH7A that cost me $10USD to get to my door.. You know its hard to get any tube to your door for $12 w/shipping. BUT there are a lot to choose from for this amp in particular. Make sure you give 6dj8s a listen too


sachu: this amp rocks so much that I can't wait to get my hands on the second board
Agree... That's why I quickly snagged up one of the protos that became available. Think its best though when those not involved in the design say such things, as has every prototyper I think.

Going with a huge 6" x 4.2" x 2.2" case for this 2nd build. A DAC may find its way in there someday



post #437 of 2213
Quote:
Originally Posted by sachu View Post
man..this amp rocks so much that I can't wait to get my hands on the second board...looks like 4 are already spoken for..I am hoping I was included in that count..

You weren't But are now...
post #438 of 2213
One of the final prototypes:
LL
LL
LL
post #439 of 2213
Looks nice MrSlim! All you need now is a black sharpie I used my son's little Tester's black paint on a SOHA build way back.....Or maybe not, the silver holes do pull in the nice chrome tube ring.

Just wanted to say the amp is great in its target case too, a breeze to tote around as TimJo's mentioned in his impressions here.



I just loved the sound & features enough to give the 2nd one a bigger home to include more goodies
post #440 of 2213
Thanks CF, I put a bit of countersink on the holes to make them stand out a bit more, and look a little more "finished" . Mine is for work duty and it fits perfectly on top of a little FM tuner I have on my desk so the ultimate minimum size wasn't so critical. I may do a small one as an amp for my Digital keyboard though, since I have the RK97 pot and probably 1/3 of the parts for it.
post #441 of 2213
Quote:
Originally Posted by MrSlim View Post
One of the final prototypes:
Is that the recommended Hammond 1455K1202BK case?
post #442 of 2213
WooHoo!
Glad to know that it reaches production stage. "The long await" is nearly end.

Timing is just about right. I'll have a long vacation next month.
I'll have enough free time to source parts, and if the board can arrive
in time I might be able to finish it before my business trip to Japan

Kudos for you guys' hard work, runeight cfcubed and proto team.


For those who are interested in the CTH, highly recommend,
read through the info. on CTH on Cavalli Audio web site.
It is quite educating and informative.

Cheers,
post #443 of 2213
Ok, dumb question for you guys. Why do the prototypes have the inputs up front?
post #444 of 2213
Quote:
Originally Posted by olblueyez View Post
Ok, dumb question for you guys. Why do the prototypes have the inputs up front?
Chris and Alex will have to chime in - but I think the design goal was to use this mostly as an amp for portable sources - hence the front I/O. Now that we know how well this amp performs, I can see more people wanting to use RCA ins...

There's also not much room for rear jacks in the target 1455K1202 case, Could be done with clever routing and no fuse/power switch.

The 1455K1602 has a bit more room, as seen in some of the other builds...
post #445 of 2213
My Mr. Slim, what a large knob you have!
post #446 of 2213
Quote:
Originally Posted by olblueyez View Post
Ok, dumb question for you guys. Why do the prototypes have the inputs up front?
Mine is on the rear side. From the left, first switch is the power, fuse, heater voltage, input. I didn't want to use RCA on the rear as I wanted to have more room between the power section and the input. Shielded cable runs up the input side to the front.


post #447 of 2213
Quote:
Originally Posted by holland View Post
Mine is on the rear side. From the left, first switch is the power, fuse, heater voltage, input. I didn't want to use RCA on the rear as I wanted to have more room between the power section and the input. Shielded cable runs up the input side to the front.



That is what I was thinkin, use a mini, OR, a larger chassis with a dac.
post #448 of 2213
FordGTLover: No, thats a 1455K1601BK, with the aluminum end panels, which means I had to go with isolated panel jacks on all the connectors. I'm partial to the aluminum look vs the "crinkle finish" plastic end panels. Ultimately the plastic end panels are simpler to deal with though. I decided to go with the 1601 because I wanted to put in a 1/4 Jack, RCA's and an RK27.

Olblueyez: a couple of the protos had input jacks at the back, but also used a bigger/different case to do it in. The spec'd case (and the 160X case) have enough room for a power switch or fuse, and the heater switch, so there's no room for any kind of input jack. I have an inline fuse on the output of my transformer just in case, which saved my bacon when I did a major faux paux, during building. Also, since all the power supplies are at the back (there are 3 of them, including some high frequency stuff..) you would need well shielded cables to route over the board. In keeping with the compact nature of the amp, it becomes a tradeoff: Looks vs functionality, and for me it wasn't a big issue to have the inputs at the front. The proto boards did not have any holes for standoffs, so you are limited to how you could mount the board. The production boards do have them, so they could be mounted in bigger cases, although the "Compact" part if this beauty is part of its cache I think.

Wiatrob, I don't know whether to Blush or say Thanks for the compliment
post #449 of 2213
I like it because its simple and small and it uses the 12AU7. I have a case full of AU7's not being used, I even have a Tung-sol 12BH7, that thing is a bear, whopper base and nice clean highs. Just make sure its Tungsol though, Tungsol put out some rebranded BH7's. Met someone here who was pissed at the results he was getting and when we compared pictures he had an RCA rebranded to Tungsol. The RCA is nice but its super thick and smooth and rolled off and slow. Tungsol has the bass weight of the RCA but its brighter up top and quicker.
post #450 of 2213
Olblueyez, I'm using a used RCA(or so said the vendor) 12BH7A and I have to say that it sounds very fast and unrolled off in the CTH. It's the first tube I tried, so I haven't got a reference point though. It could be a function of the amp though.. A few other prototypers are using the 12BH7 also and like it also, althought not sure of the manufacturer. Wanna loan me that 12BH7 Tung Sol to try out?
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