justinsweber
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Posts posted by justinsweber
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There are a few things that id do differently, but some backgroud would help frame the discussion.
Is the amp working?
Is there a specific concern?
Are you looking for paces to improve?
Thanks,
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I have a pair of LSIs.... but not with the trim... I like. I have always lusted after the LSIs.
Jim in a few weeks when my crossover comes in, Ill show you what I did with mine... a bit of radical thinking.
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All these sound like great options. I've not looked at most suggestions. I've used a pevy drive that weighed a ton but sounded great... Not really efficient enough. The fatial hf200, B&C de85 and 750 have all worked so well that they are interchangeable for my purposes of making cornscalawalls or modifying la Scalas. The faital worked amazingly but hate that it's really 1.4" when most horns are 2". again all three kicked ***. The radians have great reps, great plans does too. The B&Cs and fatials seem accessible.
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Ive seen those before :-). They look great in there. I don't think you'll be using the grills anytime soon.
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Get a C. Chong Cap board. If you want a SDS cap board instead... Ill send you the 1 spare PCB I have... The C. Chong tubes4pro power supply is much better. Order a new choke from triode electronics. Order a Poseiden PCB or VTA PCB (Driver) and you will have a very very nice amp indeed. As NOS said the 2nd amp might cost 10x as much as the 1st... On Ebay they are $300-500 each or $500-700 for a pair.
Have pics? The pre may need some love too.
All said and done, as a rebuilt it will be a very very nice amp.
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No pics?
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Just saw. $40 plus shipping and they are yours. The tweets are gone. Just the baffles now.
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Long tube life, more linear, more output... all the good only some of the bad.
I emailed Dave... apearently its been done with upto 200watt monsters.
He has a generic PCB for bringing EFB to almost any amp, but is not ready to release it.
I generally like things simplier (few parts), but Ive wanted to try this out for a bit... Wondering who has tried and what results they achieved.
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Reaching out the the brain trust... Ive seen NOS valves posts on EFB.
Has anyone applied the EFB mods to larger amps?
Is there a sperate EFB standalone PCB floating around yet?
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Im happy to wait till Aug to build... Its not as much a sales thing as it is wanting others to see proof its super doable and thus open eyes and doors to new projects.
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Looks like there is no interest.
I'm going to put off the asmbly until Aug... lighten my weekend up some.
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Trying to see if there is any interest in this. If not, Ill just photograph and build during the week.
Anyone think they are comming?
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So it appears my fondest wish has come true.
A Forum member wants to trade his B&C750s for my amps... .SOOOOOOOO BAD ASSSSS.
I have the Split La Scalas, Eliptrac horns, ordered my Ap12-500s and now Ill have the needed driver !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :-)
Turns out that an amp I did several years ago (RCA curcuit 6fq7/EL84) became his through Dave Harris.
He thought the workmanship was familar and reached out... Seems like a great way to benifit us both.
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I have the Orig Klipsch Face frame and the tweeters.
Tweeters are $90 with free shiping.
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I’ll take pics later this week. The wiring is very clean as well.
It’s a Stockish ST-35 (No DC blocking 1pf cap), larger power supply and use of choke regulation.
The real claim to fame is the Classic St-35 sound with all the modern convinces. (Modern speaker jacks, power switch and IEC).
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Thanks... Need funds for my AP12-500s on order, the MKIII are crazy expensive and need some DE85TNs.
Anyone needing a amp want to trade for some DE85s or HF200s :-)
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I normally build as a mono block with a sumed mono curcit and a vol pot for blend.... That way its a center fill.
This was my garage amp :-). (Except I dont have any speakers inthe garge :-(. )
When asked, I build this one and its smaller cusin.
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Wow... you have speakers, like I have amps... Some seriously amazing examples.
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Built by hand with meticulous care and fully tested, this studio inspired Gainclone/chip amp has a detailed sound that has captured many listeners around the world. The design was inspired by the sound quality of amps costing five times as much and have been used on many high quality professional audio projects. The basis of this amplifier project is the National Semiconductor LM3886 Series, or Gainclone Amplifier Chips. ampsandsound specializes in the design of highly integrated custom audio systems, and has utilized similar designs in hundreds of applications. 70watts into 4ohms, 50watts into 8ohms RMS. . . this is not BS amp. . . punches well above it price point and weight. Fully bench tested with noise below 2mv. 1.2v input get full power. Large heat sinks allows for continuous use without issue. We ran for 18hrs into 4ohm load and retested. . . still cool and right on spec.
Justin 323-868-9722.
$200 plus shipping
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For sale is my stalwart Dynaco St-35. Built on a larger studio chassis to allow for higher quality built and greater attention to the power supply and filtering. All parts were 100% new. The amp is approximately 2 years old with view light use as a backup system and to demo my speakers.
Transformers are exact reproductions form Chicago magnetics which builds the transformers used by Rogue Audio, same laminations, interleaving and unique UL tap. The Amp makes use of the stock Dynaco driver boards with 12WD7 driver and a pair of EL84s. Tubes are EH12WD7/ Sovtek EL84M (Miltary) All tubes have been tested on my Hickok Tube Tester TV7 and test new. The Stock Dynaco ST-35 was known as the poor mans Mcintosh MC275 due to its unusual fidelity. Output is 22watts RMS with 28watt peaks. Noise is below 3mv. . . 1.4v to full power make it possible to use with an Ipod or passive volume control. 4ohm and 8ohm taps. All the modern conveniences you'd want in a ST-35 while maintaining its classic topology and sound.
Justin 323-868-9722$600 plus shipping.
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Thanks Dave.... The pics are of my old pair...
Im going to build very similar but add a cover plate for the driver PCB and remove the AC balance. Should yield better user exp/easier to maintain without loss of performance.
When do Ill bring for a road test. Now if I can pry the F5 form you.
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OK... Ive rewritten my post 3 times... I hate copy paste...
1 The AC bal is for the bias to the power tubes. Shannon believes I can omit without issue. My idea is to remove the CCS and replace with a resistor... again endorsed by Shannon. Making it super simple... I bias pot, 1 set of test points. Will prob mount all components downward and get FPE to cut a plate for the PCB as a cover... Making for a cleaner look.
This pair wasn't to be sold... I built a pair like this and sold off to get my Mcintosh C220... So Im kinda coming home.
I really like the Poseiden PCB and the C. Chong cap board. The Cap board is tailored to fit the Triode chassis. Mr. Chong lives close, so years ago I brought him the chassis and week later we got a PCB that fits like a glove.
Basics on the build are ~750 each without case. I can share sources for all parts to anyone needing. To build/sell would prob be $2100 with tubes.
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all great prices
Tube amp guys... GIH
in Technical/Restorations
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Build looks solid for that thinking.
whats the circuit/tubes?
Its P-2-P so anyone can redo if needed.
Is it in the 200 range?
If not go Decware kit or DIYtube kit and Edcor iron.