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Old 21st March 2009, 04:06 PM   #21
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Default Standel History

Hey guys,

I though you all might enjoy my little bit of Standel history. In the mid 80's, I went to work for Barcus Berry, makers of pickups for every instrument imaginable, who were putting together a new company called BBE to make sound processors. I was to be the assistant to a fellow named Bob Crooks, who invented the BBE sound processor. Bob was in his mid 60's at the time, I was in my 20's, and my job was to learn all about the processor, pick his brains, etc. While we worked on the processor product, I learned the history of Standel from Bob through lunchtime stories. He was the founder. Bob Crooks WAS Standel.

Those amps were truly remarkable. Bob was a unique old S.O.B. In the day, he made a huge range of amps, big ones, little ones, all designed for purity and clean sound. The voicing was all done by hand ( Bob Crooks' hand and ear), and was magic, plain and simple. In the course of my two years working with him, I was fortunate to hear a few amps that were brought to Bob for refurbishing. At Barcus Berry, we had an amazing guitar tech and musician named Johnny Davis. Bob would finish up an amp, then Johnny would come in and play before the amp got shipped out. As I remember, Johnny favored L5's and several Gibson Custom Shop fat semi-hollowbodies. The tone was just sublime.

Bob was definitely not a rock and roll guy. Wes Montgomery used his amps exclusively, and I guess that Wes was the paragon of Bob's idea of who was worthy to use his amps. The Beatles not so much. Bob told me that their manager called him as they were getting ready for their first US tour, to see if they could borrow a set of Standel amps. He told them to shove off.

Standel made hundreds and hundreds of amazing tube amps. When RCA came out with their first line of power bipolar transistors, Bob jumped into the new world of Solid State with both feet. Unfortunately, the concept of Safe Operating Area was not well understood quite yet, and the amps failed by the dozens. Bob went out of business in a matter of months, and it made him a bitter old man.

But those amps....oh my. If your re-creations are anywhere close to the original then you have made yourselves a real treasure.
I take my hat off in salute to Bob Crooks up there in Music Heaven. A crotchety old genius.

cheers
Adam Reed
Ashland Oregon
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Old 21st March 2009, 04:52 PM   #22
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kaw-liga,

When I built my 25L15 clone I used a pair of 5W 350 Ohm resistors in parallel to get 175 Ohms at 10 Watts.

Since the amp only puts out about 25 watts the Hammond 1650H rated at 40 watts would do fine. I just happened to have an old Scott hi-fi output transformer from a 35 watt amp that had the proper input impedance of 6600 Ohms.

I built my amp using 1/2 Watt carbon film resistors as I do in all the amps I build and have not had any problems. All of the capacitors are Mallory "Orange Drop" style.

As I stated earlier in one of the postings the JBL D130 speaker is the heart of the Standel 25L15. Without that speaker you can not really ever achieve the 25L15 sound, in my opinion.

Guitar88
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Old 21st March 2009, 05:47 PM   #23
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thanks alot guys, i was thinking of doing the 350 ohm 75 in parallel, and find a jbl d130 used. everybody that uses these amps always has such nice clean tones, for guitar and steel. thanks again. im sure i will have many more questions.
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Old 21st March 2009, 09:22 PM   #24
Trout is offline Trout  United States
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Location: Midwest Madman
Quote:
Originally posted by guitar88
kaw-liga,

When I built my 25L15 clone I used a pair of 5W 350 Ohm resistors in parallel to get 175 Ohms at 10 Watts.

Since the amp only puts out about 25 watts the Hammond 1650H rated at 40 watts would do fine. I just happened to have an old Scott hi-fi output transformer from a 35 watt amp that had the proper input impedance of 6600 Ohms.


As I stated earlier in one of the postings the JBL D130 speaker is the heart of the Standel 25L15. Without that speaker you can not really ever achieve the 25L15 sound, in my opinion.

Guitar88
According to the Data Sheet, and I have 6 of the Hammond 1750H transformers here, they are 20W, and I can tell you they are fairly small. In fact, compared to the transformer in your pictures above nearly 1/2 the physical size.

1750H 6,600 C.T. 8ohm Push-Pull 20W for Fender Deluxe, Deluxe Reverb

These tend to saturate easily even in a 15W tweed deluxe circuit.
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Old 22nd March 2009, 01:31 AM   #25
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i was looking at the hammond 1650h to use as its rated at the 40 watt. the 1750h is too low of a wattage transformer. Also using your advice with the 1 watt carbon film. For the extra couple of bucks it costs why not. also thanks for the part number for that 180 ohm 10 watt resistor, its like you read my mind about ordering from mouser. im looking into the hammond transformers because they are easy for me to get, and i get them near cost.
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Old 15th May 2009, 06:40 PM   #26
k9swc is offline k9swc  United States
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Beautiful jobs, both! But, Guitar88, aren't you nervous about posting a schematic claiming to be a Standel clone when Standel is still making them? (I'd be concerned about litigation... except I suspect any patents may have long since expired.) Btw, I'm a Joliet native! Cheers,
Bud
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Old 29th July 2009, 03:56 PM   #27
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Default Standels and EchoSonics

Hello everyone,
I am new to the forums but I have been reading quite a bit since 2004, tweaking my own amps. Perhaps you've seen some posts about my 1954 prototype Fender Bassman SN 0013.

I am interested in building a Standel 25L15 replica (I have a 16Ohms 15" 1954 JBL waiting), as well as a Ray Butts Echosonic replica.

If anyone (Guitar88, MBL, etc) would be able to get the schematics out to me, I would be forever in debt. I understand the importance of keeping this stuff in the groups of the few who understand the priviledge of having these instruments and would fully cooperate to keep their secrecy.

Pleas PM/email me if at all possible, I can even call you anywhere in US/Canada on my dime. I play rockabilly music with my '52 Telecasters only, Carl Perkins / James Burton style, and listen to Carl Perkins and Ricky Nelson records my whole life. I fix old vacuuum tube televisions and radios and I have been getting into guitar amplification (lots of Gerald Weber books and DVDs) for the last 5 years.

Thanks,
Frank
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Old 6th August 2009, 09:29 PM   #28
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Default Standel 25L15 schematic

Hello everyone!

Lotsa talk all over the 'Net about Standels and Echosonics!!! NICE!

I guess if someone else can post a schematic of this amp, so can I, right?

Here's one that I'm sure people will recognize. It's freely available online. Just find a link to a schematic called "807_schem.jpg" and change the link to "jp25_schem.jpg" and you can download it. This link is found on many threads I've seen on Standel schematic serches.

PS I REALLY REALLY want a Ray Butts EA-1 Echosonic, AKA 1958-196x Rickenbacker M-30 Ek-O-Sound. PUHLEEZE someone contact me if you have a manual, instructions for any parts of these amps, anything at all. I need one of these, guys..........Please.


Thank you kindly!

Frank
1954 Fender Bassman 5D6 SN 0013
1963 Ampeg Super Echo Twin ET-2-B
1967 Ampeg B-12XT
1953 Gibson GA-30
1968 Vox Berkeley II (tube)
2001 Fender Pro Reverb (1st year reissue)
2 x 1952 FENDER TELECASTER BLACKGUARDS
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Old 6th August 2009, 09:29 PM   #29
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Default STANDEL 25L15 SCHEMATIC

A WORKING STANDEL 25L15 SCHEMATIC
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Old 7th August 2009, 03:25 PM   #30
k9swc is offline k9swc  United States
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The JP25 is Ted Weber's rendition of the Standel 25L15, and doesn't seem to be available yet, even though he publishes the schematic freely. Caution, however - although tube complement is the same, the schematic differ significantly from the original, and I don't know if the layout is similar since it's not published. Not having heard a JP25, I don't know how the sound compares to an original - which I played through briefly when I worked on one - but I understand that you can get similar output from different circuits, so perhaps it would serve as a suitable substitute if you aren't concerned about circuit accuracy. The photo of his cabinet seems to replicate the original, what you can see of it, and the price is very reasonable - I plan to order and build one as soon as they're available!

Bud
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