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Old 12th May 2008, 04:20 PM   #11
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Default Many Thanks

Thank you everyone for the compliments on the amplifier.

I can't say that the schematic exactly matches the original. During my hours of digging up facts I found out where the tone control notch was, how similar the circuit was to certain Gretsch amplifiers, what class the amp ran in, the speaker used, the physical size, tube setup, etc. From all of the tidbits I was able to piece together the schematic. I have to say that I am pleased with the results.

I used a Hammond 272FX for the power transformer mostly because I had one on hand. A better choice would be the 273BX this gives a higher B+ voltage and would allow using a 5U4GB rectifier as the original used. I used the GZ34 rectifier because of the lower internal voltage drop, thus maintaining the same output power from the amp.

My output transformer came from an old Scott or Fisher stereo. It happened to have the correct impedences and physical size I needed.
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Old 17th September 2008, 09:37 PM   #12
PJD is offline PJD  Netherlands
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Here's my clone:
Click the image to open in full size.
Click the image to open in full size.
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Old 27th October 2008, 10:49 AM   #13
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Interesting thread. Thanks for the schematic. The front end looks to be based on Gretsch Chet Atkins amp?

DP-that Standel clone is beautiful, well done. Did you copy an existing amp or locate a schematic. It doesn't look like your o/p tubes are on the bottom chassis.

Whadaya mean 'not use Chet Atkins and awesome in the same sentence'......?
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Old 27th October 2008, 05:42 PM   #14
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To PJD, I assume your output tubes are horizontal under the perforated covers. Very nice work and the Standel logo looks pretty good.

Did you actually find a Standel schematic or did you piece together a circuit the way I had to??
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Old 29th October 2008, 04:46 PM   #15
PJD is offline PJD  Netherlands
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I found somebody with an original Standel that was kind enough to take measurements and photographs.
Also have the original schematic, and it is quite a bit different from the schematic made by guitar88 (pretty impressive making a schematic from scratch). I do hope your amp sounds great btw. A very big part of the sound is the JBL, using a D130 (or K130) is essential.

The wiring in the original Standel and the schematic where exactly the same. I was worried that the original amp had been messed with and would sound different from what you hear on the records.

Unfortunately I had to promise not to share the info (sorry).

The 5U4G is on the left (seen from the back) and the two 807's are on the right under the covers. Bottom chassis stands on shock mounts (the same ones as on the original). Pre amp tubes and phase inverter are on the top chassis.

Basically I made a 1:1 copy with as many original parts as I could find.

Made the logo in Illustrator and had that printed on a transparent sticker and stuck that to the back of a piece of plexi.

Here's the faceplate, did that the same way:
Click the image to open in full size.
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Old 29th October 2008, 05:33 PM   #16
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PJD is absolutely correct. The JBL D-130 is very important to the sound.

The amp has a very clean clear sound and brings out the best from my Gretsch Country Gentleman. Unfortunately, I can't quite play like Chet Atkins.

The PJD clone is a piece of art. My next task is to cover my copy in tweed to give it a '50s look. Other than to give it the physical size I wasn't trying to give it the Standel appearance. I have the rectifier , phase splitter and outputs on the bottom chassis and the two preamp tubes on the upper chassis.
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Old 29th October 2008, 09:05 PM   #17
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to PJD and Gtr88
I have to say a resounding 'well done' to both you gentlemen. PJD, I am totally amazed about how accurately you've finished the cab, logo and panel.

I tried a reissue 25L15 a couple of years ago here in the UK and at the time wasn't too impressed with the sound with my Gretsch CC. Maybe they aren't making them quite the same.....? (It looked great.) Or maybe I just didn't know how to set it up.

I tried an extensively tweaked Invicta amp last week, and was v. impressed with how that sounded and responded with my Gretsch NC. The nearest to the Chet sound I've ever got.

My comment about Chet was directed at Nhuwar, not quite sure what he meant.
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Old 30th October 2008, 06:31 PM   #18
PJD is offline PJD  Netherlands
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Gentlemen, thank you for your kind words.

Bananafist:
Was the reissue a three knob? I can imagine that the version with added controls can sound very different from what a Standel is supposed to sound like.

My amplifier sounds amazing. It is the best amplifier I have ever tried, not because I built it, but because Bob Crooks did a great job.
Very odd that the reissue didn't sound good to you. I have shown my amp to several people, and they all are struck by the great sound. It is the best amplifier for steelguitar, (clean) rockabilly, jazz and country as far as I'm concerned.

The only other cool amp from the fifties is the EchoSonic (and that's my next project ).
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Old 21st March 2009, 02:18 PM   #19
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hey, i noticed this thread has be inactive for a bit but i hope someone can help me out, im looking into building one of these amps using the provided schematic. ive built a few tube projects and fixed some, just need a had with component selection. i was looking at output transfromers, i was looking at the hammond 1650ha, or a 1750h. which would be the best choice (or even a totally different one)? also some recomendations on types of components (capacitors types in areas or the circuit) and would 1/2 watt resistors be sufficient fro a circuit like this, i noticed that there is a 175 ohm 10 watt resistor, this seems like a odd value at that wattage, and ideas on getting one? well i hope someone out there can give me a hand with these questions. looking to build this for use with my steel guitar. thanks alot everyone.
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Old 21st March 2009, 03:35 PM   #20
Trout is offline Trout  United States
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Quote:
Originally posted by kaw-liga
hey, i noticed this thread has be inactive for a bit but i hope someone can help me out, im looking into building one of these amps using the provided schematic. ive built a few tube projects and fixed some, just need a had with component selection. i was looking at output transfromers, i was looking at the hammond 1650ha, or a 1750h. which would be the best choice (or even a totally different one)? also some recomendations on types of components (capacitors types in areas or the circuit) and would 1/2 watt resistors be sufficient fro a circuit like this, i noticed that there is a 175 ohm 10 watt resistor, this seems like a odd value at that wattage, and ideas on getting one? well i hope someone out there can give me a hand with these questions. looking to build this for use with my steel guitar. thanks alot everyone.

I would use a 180 ohm 10W wire wound mouser part number below. $1.75

The 5 ohm difference would be insignificant.

Mouser Part #: 588-20J180E
Manufacturer Part #: 20J180E
Power Resistors Wire Wound Vitreous Enamel
I like these because they are more compact than the ceramic style.

Most of the circuit could be 1/2W, though on Guitar amps I tend to use 1W carbon film.
I have used 1/2W carbon comp on many many builds, but even good quality ones tend to be noisy.


I would think that using the 1750H would be borderline to small.
Those are generally in a Deluxe Reverb 6V6's at around 22W

http://www.hammondmfg.com/pdf/5C_GuitarLine.pdf

One thing about Standel's, you want big big fat clean tones. A Big ole output trans is the way to go.
I think I would use an Edcor
http://www.edcorusa.com/products/tra...0-ms-7_6k.html
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