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A Very Compact Hybrid Amp - Page 31

post #451 of 2213
Quote:
Originally Posted by olblueyez View Post
I like it because its simple and small and it uses the 12AU7. I have a case full of AU7's not being used, SNIP
You owe yourself a crack at this amp if you love tube rolling (and I can tell you do ) and especially the 12BH7...
post #452 of 2213
Quote:
Originally Posted by HeadphoneAddict View Post
I suspect I might be a suspect?
You are the next on the review list, it's making it's way south to you!
post #453 of 2213
Quote:
Originally Posted by runeight View Post
Tubes like 12at7 and 12ax7 will probably not work. Their operating points are just outside of what the tube servo can do. This is because neither of them is happy at 80V.
I can confirm that the 12ax7 will NOT work, having attempted to use it as my first test tube, causing much frustration on my and Runeight's part..
post #454 of 2213
Keyid : Do you have any internal pics of your build? Id love to see what it looks like with the stepped attenuator. Did you use a Hammond Case?
post #455 of 2213
Quote:
Originally Posted by wiatrob View Post
You are the next on the review list, it's making it's way south to you!
I'll make Bluto, Sherwood and Naamanf get to hear it too!
post #456 of 2213
Quote:
Originally Posted by HeadphoneAddict View Post
I'll make Bluto, Sherwood and Naamanf get to hear it too!
Sherwood is actually hoarding it now
post #457 of 2213
Hey, has anyone tried a 6N1P in it yet? There are tons of Russian ones on Ebay and cheap too.
post #458 of 2213
Quote:
Originally Posted by MrSlim View Post
Keyid : Do you have any internal pics of your build? Id love to see what it looks like with the stepped attenuator. Did you use a Hammond Case?
Havent made much progress on the casing... I hope to find some time in the next coming weeks. I got a hammond case but its the longer version and all the components does seem to fit nicely.
post #459 of 2213
Does anyone have a 6N1P to spare...Or how do you guys feel about making a group buy for some 6N1Ps from ebay..10 tubes is about 22 shipped...plus additional shipping (probably 3 $ each)..

I wouldn't mind doing handling the group buy if 4 more join in. That way each of us gets a pair of the tubes..total should work out to about 7$ for the pair of tubes shipped to your door..if more are interested, then we can order about 20 tubes..

Pm me if anyone wants to take this forward.
post #460 of 2213
I'd be up for it even though I'm not going to build this amp soon.
post #461 of 2213
Quote:
Originally Posted by scompton View Post
I'd be up for it even though I'm not going to build this amp soon.
There is the 6N1P-EV version which is supposed to be superior for 17$ + 12 $ shipped for 10 tubes (5 pairs). If you guys want to go for that then the price for a pair may end up being about 9$.

Source of the tubes to maintain full disclosure

Please note that I am quoting shipping to lower US only... Shipping to Canada is not a problem for me but might cost a little bit more (First class International from USPS)

Got a quote of 45$ for 20 6N1P-Ev tubes shipped to me..So that makes it out to be 10 pairs: Including shipping to lower 48 states, a pair of these tubes should come out to our target of $4.5 + First class mail USPS shipping to your zipcode from mine (97219).

If you want more than one pair let me know. group buy is now closed.
Depending on how many members we have signed up by then I will go ahead with either of the group buy options :

1> 5 pairs of tubes. I might even get the seller to sell me the exact number of pairs if more than 5 but less than 10 pairs have been spoken for.
2> Order the 10 pairs is we have at least 8 - 9 pairs spoken for.

A running count of members interested in this:
member (no of pairs) (Country)
1> Sachu (1) (USA)
2> Scompton (1) (USA)
3> MrSlim (1) (Canada)
4> zkool448 (1) (Canada)
5> nux (2) (Australia)
6> keyid (1) (USA)
7> TimJo (1) (USA)
8> rds (1) (Canada)
9> jacc1234 (1) (USA)

_______________________
Total no of pairs = 10
_______________________

Disclaimer:
Tubes being tubes..there might be a few in the lot that may not work, microphonics or noise...please be aware of this. hence the reason for going in for pairs, redundancy. I will test each one in my own amp to make sure at least one working tube makes it to each member in the worst case scenario where half the tubes are non-functional
post #462 of 2213
Quote:
Originally Posted by olblueyez View Post
Ok, dumb question for you guys. Why do the prototypes have the inputs up front?
Think wiatrob covered this pretty well... The 1st 2 posts in this thread talk about the goals for the project - A prime one being small form factor. Then over time, much design work (sims, PCB layout, etc) and prototyping, it was found desktop class performance (superior, according to impressions here) could be delivered in the target case. If every inch was put to good use.
With the PS components in the rear of the PCB, builds in the target case would need to be creative to fit rear RCAs...

Quote:
Originally Posted by olblueyez View Post
I hope this ends up in kit form, if it does then I want 3.
You may build your three any way you wish I'll have front (mini) & rear (RCA) inputs on this 2nd build as well as mini + full size front output jacks, RK27, etc. BTW, it is saying something that most those w/protos are looking to build another.

Looks like we may be seeing a lot of CTH builds around here in the next month or so and we'll get to see lots of ideas WRT casing & integration.
post #463 of 2213
sachu, I'll go for either, so whatever the group decides.
post #464 of 2213
ill try one or pair (however it comes) 6N1P-EV, heater uses 6.3v?
post #465 of 2213
Just wondering if one of these 220uH inductors might be a good Mouser available one:
RLB9012-221KL
18R224C

First one datasheet shows max current as 1Amp (not 1mA as shown on the mouser page..) Lead spacing looks about right compared to the BoM Digikey one. Second one is slightly wider but has a lower DC resistance.
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