Home Made Amp Photos-Post them here!

Niteshade · « **on:** 8 Nov 2009, 01:11 pm »

I always liked the vintage car shows. What about a home made amp show? This seems like a great place to display your creations and talk about them. I make amps for myself when time permits. Here's a photo of one:

I like the variable input voltage control on the power transformer (metal knob on front of transformer). This is one of my personal amps. The wattage is only around 8 watts/channel MAX. I didn't want to stress anything since it's a well seasoned senior citizen. Original tube compliment was 2A3's according to the available filament voltage. It's using 807's now.

Niteshade · « **Reply #1 on:** 9 Nov 2009, 12:48 pm »

Nobody has a home brew amp to talk about or display? I thought there were allot of DIY'ers on here. What about preamps?

mgalusha · « **Reply #2 on:** 9 Nov 2009, 06:47 pm »

I built a pair of the Transcendent SC-150's some years ago. I bought the chassis from Bruce after he had stopped making the amps. All the internals are point to point, no pcb.

I built a tiny little pre, originally as a clone of a Decware ZSLA but earlier this year designed a new circuit as I decided I wanted/needed some gain and so it looks the same but now sports a 6GU7, still a single tube for two channels. It sits on my desk at work and I'm very happy with it.

Somewhere I have pictures of my main preamp. I'll post one if I can find them.

JakeJ · « **Reply #3 on:** 9 Nov 2009, 11:06 pm »

Wow! Those are cool, both Blair and Mike.

While I haven't truly made a homemade amp I did remake these:

It took me about three months with all the painting.

poseidonsvoice · « **Reply #4 on:** 10 Nov 2009, 01:50 am »

Poseidon's Voice Preamp/Headphone amplifier:

Power Supply:
Full wave with choke input using Electraprint power transformer with electrostatic shielding, 6CJ3's, Lundahl chokes (LCLC), Jensen Electrolytics and GE oil caps.

Circuit:
Parafeed circuit using a WE396a with Gary Pimm Pentode Mosfet Cascode Constant Current Sources (EL84's), Lundahl input transformers and Magnequest B7 nickel output transformer.

African Bubinga Chassis

Pics Below:

Cost?

Don't ask.

Anand.

Niteshade · « **Reply #5 on:** 10 Nov 2009, 02:22 pm »

Nice stuff!

JimJ · « **Reply #6 on:** 10 Nov 2009, 02:42 pm »

8 watts of fury...

poseidonsvoice · « **Reply #7 on:** 10 Nov 2009, 02:45 pm »

Quote from: JimJ on 10 Nov 2009, 02:42 pm

8 watts of fury...

Didn't know they made resistors in Barbados! Nice work.

Anand.

planet10 · « **Reply #8 on:** 10 Nov 2009, 07:08 pm »

RH84 monobloks... these have held their own against much pricier kit.

There was something like 7 distinct iterations to get to this amp... here is one of the earlier chassis where junk box parts replaced the major iron stripped out of it. A real international here, Grundig trafo, Hammond choke, Magnavox OPTs.

Total cash investment in both amps <$200, so these are serious frugal-phile(tm) kit

dave

jtwrace · « **Reply #9 on:** 10 Nov 2009, 07:11 pm »

I like your Cat 5e cables

Oh, nice amps btw

Niteshade · « **Reply #10 on:** 10 Nov 2009, 11:45 pm »

I don't see any electrolytics in there- am I right?

Quote from: planet10 on 10 Nov 2009, 07:08 pm

RH84 monobloks... these have held their own against much pricier kit.

There was something like 7 distinct iterations to get to this amp... here is one of the earlier chassis where junk box parts replaced the major iron stripped out of it. A real international here, Grundig trafo, Hammond choke, Magnavox OPTs.

Total cash investment in both amps <$200, so these are serious frugal-phile(tm) kit

dave

planet10 · « **Reply #11 on:** 11 Nov 2009, 04:31 am »

Quote from: Niteshade on 10 Nov 2009, 11:45 pm

I don't see any electrolytics in there- am I right?

All Solen power supply filter caps (makes such a serious difference every amp since does too). 2 elco bypasses.

dave

56oval · « **Reply #12 on:** 11 Nov 2009, 10:51 am »

Hi
This is my pre-amp ,the first thing I've ever built from scratch . 6H30PI valves line output transformer based ,.Its a circuit drawn up by a friend .He also make's OPT's ,power tranformer's & choke's .
Pre amp stage ,the 600ohm OPT are wound to suit the 6H30PI ,no caps or resistor's in the signal path

Dual power supply's using 5V4 rectifier's .

Veiw of the back

Experimenting with different by-pass caps on the cathode ,set up on a 3 way switch.

Cheers

JimJ · « **Reply #13 on:** 11 Nov 2009, 02:11 pm »

Sweet

Pez · « **Reply #14 on:** 12 Nov 2009, 05:49 am »

Because it is very much a work in progress, but I cannot resist giving you guys a 'teaser' here's my yet to be completed amp.

joeling39 · « **Reply #15 on:** 12 Nov 2009, 07:03 am »

Well, here's mine :

Transcendant Sound T8 OTL DIY

System

Vacuumstate FVP linestage

power supply for the FVP

Kind of crude but still in my system.

Regards,
Joe Ling

JimJ · « **Reply #16 on:** 12 Nov 2009, 05:34 pm »

Quote from: Pez on 12 Nov 2009, 05:49 am

Because it is very much a work in progress, but I cannot resist giving you guys a 'teaser' here's my yet to be completed amp.

What a tease...we want amp pr0n

poseidonsvoice · « **Reply #17 on:** 13 Nov 2009, 03:00 pm »

Quote from: joeling39 on 12 Nov 2009, 07:03 am

Well, here's mine :

Regards,
Joe Ling

That FVP and Transcendent OTL are EXCELLENT choices. Beautiful work. Who needs to purchase retail when you've got mirror finished monoblocks such as yours???

Anand.

jeffdavison · « **Reply #18 on:** 21 Nov 2009, 06:20 am »

Some of my handy work.
A dual mono 6550 SE integrated using a Mullard ECC34 / 6H30p-DR driver stage.
A pair of Dual mono SETS, a DC 437a driver / EML 320BXLS power tube
and a Pete Millet inspired Low-Mu preamp converted to dual mono rectification.

JD

mjosef · « **Reply #19 on:** 21 Nov 2009, 06:37 am »

Wow...very classy. Gotta' love the look of wood.