Amp Guts Photos - Official Thread - Lets see those pics

[BassmanPaul]

This is a twin channel tube pre-amp I designed a few years back. The two neon rockers are power and standby. The power also switches the mains Socket on the back panel to control the power amp. First control on each channel is Gain. It controls two stages from a 12AX7 using a negative feedback loop. Next is Volume,Treble and bass. Next, two switches to mute each channel. The LED on the switch indicates the channel is active while the blue LED signifies that the output is enabled. Output comes from a cathode follower using both halves of a 12AT7 and that feeds the output transformer. This is a reverse connected Altec, made by Peerless, microphone input transformer. Two independent balanced 300Ω outputs XLR for DI and TRS for the power amp. it's completely point to point wired. Heaters fed with 6.2V DC via a five amp @ 5V TO3 regulator.

 

[Chef]

Dude: that's compleeeeeeetly pimpin'!!!!

 

[okcrum]

Does anyone have a picture or wiring diagram of an Ampeg SVT-3PRO where I can make out how to re-attach the wires from the transformer and front power switch to the board? I tried taking pictures with my cell phone, but it messed the pics up so I can't make out how to hook them all up. PLEASE HELP!!!!!

Contact Ampeg tech support if all else fails. They'll send you the info you need. They've been quite responsive to me since the last LOUD reorg.

[email protected]

Nice unit there, Paul!

 

[BassmanPaul]

Dude: that's compleeeeeeetly pimpin'!!!!

Why thanks Chef!

I saw this little chassis box that was quite inexpensive so I bought two. However the thing was too small to be rack-able so I cut an appropriately sized hole in a blank 2U panel and mounted it to that. I AM pleased with it. It's very quiet and has lots of available headroom. It's implemented with 2W 1% high stability resistors and the tone stack is B15 all the way.

 

[Dominic D]

Here's the head from my Markbass Mini CMD 121P:

 

[anotherlin]

It's a preamp, but I guess it's still ok for this thread.

So this is a picture of my partially working ADA MB-1 MIDI preamp. It is both solid state (using opamp IC) and tube, you can see two 12AX7 tubes out there. It has chorus and a compressor.

So far, the solid state side works well, and sounds good actually. But the tubes just don't and I've not tested chorus and compressor.

I bought it dirt cheap, and it is a project of mine to fix it.

 

[chillerthanmost]

'71 Univox UX1501

'69 Sound City B100

 

[drumNbass28]

Many people have been asking for the gut of an Ashdown ABM (ABM C115-500 EVOIII combo) So here they are

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[Mr. Foxen]

Some Grampian thing I just picked up:

 

[stiles72]

Ampeg Portaflex PF500

Ampeg BT15

Oliver PA100XR

 

[will33]

This is a twin channel tube pre-amp I designed a few years back. The two neon rockers are power and standby. The power also switches the mains Socket on the back panel to control the power amp. First control on each channel is Gain. It controls two stages from a 12AX7 using a negative feedback loop. Next is Volume,Treble and bass. Next, two switches to mute each channel. The LED on the switch indicates the channel is active while the blue LED signifies that the output is enabled. Output comes from a cathode follower using both halves of a 12AT7 and that feeds the output transformer. This is a reverse connected Altec, made by Peerless, microphone input transformer. Two independent balanced 300Ω outputs XLR for DI and TRS for the power amp. it's completely point to point wired. Heaters fed with 6.2V DC via a five amp @ 5V TO3 regulator.

Paul, you need to be selling these things....that is awesome.



I'd forgot about this thread. I'll take some shots of some more commonly used bass amps I have over the weekend, but for now, here's a couple of my 1940's RCA 15 watt military amp that'll be getting a good overhaul as soon as I can get the household settled into a new place, get some "life stuff" out of the way and focus on it.

I do have some metal can 6l6's for it courtesy of a very nice Canadian TB'er but as you can see, that's not all she needs. Surprisingly, it makes sound as is....scratchy, noisy sound with some notes in it.

 

[MrDOS]

I've got a bunch more, but here's a recent set from an Alembic F1-X:

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[Jeff Scott]

I've got a bunch more, but here's a recent set from an Alembic F1-X:

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This was on ebay recently, right?

 

[Morten_B]

My Ashdown Little Bastard...

 

[Morten_B]

And my MarkBass LM III (again on top of the Ashdown Klystron 1000 for size reference)...

Had to take it apart for voltage converstion, so better pics of the guts

 

[stiles72]

Anyone have some good gut shots of the preamp section of an SVT-VR?

 

[matti777]

Here it is

 

[bb5000]

The guts of the Weber 6S100 that I built last summer:

 

[deekay911]

Here's the guts of my '63 B-15N

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[FenderAmpeg]

Anyone have some good gut shots of the preamp section of an SVT-VR?

Anything in particular you want to see, I can open mine up.