2 trannie/9V version of Sekova wedge fuzz (Data Dump)

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2 trannie/9V version of Sekova wedge fuzz (Data Dump)

Postby simonm » Thu Nov 06, 2008 9:09 pm

The first Sekova chrome wedge is a faithful clone of the Maestro Fuzztone FZ1-A operating on a single AA battery - 1.5V. There is an eyelet board version and a pcb version of this one.

The next version has the same enclosure but an entirely different circuit (FA II) - seen here.

photos show - whole of interior (modified with an extra hole for input jack), close up of component side of pcb (numbered), and bottom of pcb (it was covered in tape, but adhesive was mostly dried up and it came away easily). Transistors are Matsushita 2SB173 - PNP Germanium. Diodes probably germanium. The white component is a polarised tantalum capacitor. This version seems to have been also been branded Apollo and Crestwood, in the same enclosure, sometimes painted black - see http://www.freestompboxes.org/viewtopic.php?f=19&t=2205&p=38121&hilit=sekova#p38121

A third version, with the same 2 transistors, with silicon diodes, a different pcb and different resisistor values exists - an Ebay seller sold off a batch of NOS units of this type this year (2008). Photos of Andy Carrell's one can be seen on the old forum in the post http://dam.10.forumer.com/viewtopic.php?t=1439&highlight=sekova
Attachments
SEKOVAbtm.jpg
SEKOVAbtm.jpg (161.89 KiB) Viewed 3876 times
SEKOVAtop.jpg
SEKOVAtop.jpg (102.93 KiB) Viewed 3874 times
SEKOVAtop2.jpg
SEKOVAtop2.jpg (109.92 KiB) Viewed 3870 times
Last edited by simonm on Tue Nov 11, 2008 11:03 am, edited 3 times in total.
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Re: 2nd version of Sekova 'chrome wedge' fuzz

Postby simonm » Fri Nov 07, 2008 10:23 pm

values

R1 - 27K
R2 - 100R
R3 - 15K
R4 - 5.6K
R5 - 5.6K
R6 - 27K
R7 - 5.6K
R8 - 15K
R9 - 5.6K
R10 - 22K
R11 - 22K
R12 - 68K

C1 - 10uF
C2 - 10uF
C3 - 33uF
C4 - 33uF
C5 - 10uF
C6 - 10uF
C7 - 10uF
C8 - unknown poly
C9 - unknown tant
C10 - 0.001uF

Q1, Q2 - 2SB173
D1, D2 - Ge diodes
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Re: 2nd version of Sekova 'chrome wedge' fuzz

Postby Dragonfly » Mon Nov 10, 2008 8:17 am

SCHEMATIC ...special thanks to our friend Analogguru for reversing it and drawing it up


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Re: 2nd version of Sekova 'chrome wedge' fuzz

Postby simonm » Mon Nov 10, 2008 8:32 am

Yay - thanks to AG at freestompboxes, above and beyond call of duty etc.
The component numbering on the schematic is different than on my image above, I'll redo it later.
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Re: 2nd version of Sekova 'chrome wedge' fuzz

Postby psycho*daisies » Mon Nov 10, 2008 7:20 pm

Here's some photos of my two Sekova wedges.

Neither are the version 1 (Maestro FZ-1A copy)

Besides the differences in components, there are a few cosmetic differences.

One has knobs with a clear top with "V" labeled on both,
and the other has solid black plastic knobs with "V" and "T" labels...

I'm guessing the V/V one came first, i think the version 1's had the same knobs...
Attachments
Sekovas.jpg
Sekovas.jpg (95.37 KiB) Viewed 3706 times
Sekovas2.jpg
Sekovas2.jpg (82.26 KiB) Viewed 3704 times
SekovasTOP.jpg
SekovasTOP.jpg (82.5 KiB) Viewed 3704 times
SekovasSide.jpg
SekovasSide.jpg (76.08 KiB) Viewed 3704 times
Last edited by psycho*daisies on Mon Nov 10, 2008 7:46 pm, edited 1 time in total.

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Re: 2nd version of Sekova 'chrome wedge' fuzz

Postby psycho*daisies » Mon Nov 10, 2008 7:22 pm

Sekova circuits..two different versions.
The top one came from the same guy who had a stash of these (where Andy got his from).

Simon, yours looks like a combination of components between these. :smashed:

Yours has the big barrel trannies (like the bottom one here) but with the blue
caps & white tantalum cap like the top one.
Plus yours has different Ge diodes (D1 & D2) than either of these!

the Sekova saga continues...
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SekovaCircuitII.jpg
SekovaCircuitII.jpg (66.41 KiB) Viewed 3698 times
SekovaCircuitIII.jpg
SekovaCircuitIII.jpg (72.99 KiB) Viewed 3695 times

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Re: 2nd version of Sekova 'chrome wedge' fuzz

Postby analogguru » Mon Nov 10, 2008 9:16 pm

That´s the same circuit on a slightly modded pcb.
Replace the 27k resistors with 33k, the 5k6 resistors with 4k7 and the Ge-diodes with Si-diodes and you have got it.
I will draw a schematic with the different values later on.

What is written on the transistors of this unit ?

BTW, it has to be Version III and IV. :wink2:
The first version was the Fuzz-Tone clone wired inside like the FZ-1A.
The second version was the same (or similar) circuit with 3 transistors mounted on a pcb - Sir HC has one of them.

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Re: 2nd version of Sekova 'chrome wedge' fuzz

Postby simonm » Tue Nov 11, 2008 11:00 am

analogguru wrote:BTW, it has to be Version III and IV. :wink2:
The first version was the Fuzz-Tone clone wired inside like the FZ-1A.
The second version was the same (or similar) circuit with 3 transistors mounted on a pcb - Sir HC has one of them.

analogguru


I've changed the thread title and some text in the first post...
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Re: 2 trannie/9V version of Sekova wedge fuzz (Data Dump)

Postby devnulljp » Thu Mar 19, 2009 1:31 pm

So, do you guys know what this one is?
Sekova Fuzz
3x Matsushita 2SB175 Germanium PNP (?)
Is this the v1 FZ-1 circuit?
Image
Image
Image
Last edited by devnulljp on Wed Mar 25, 2009 10:35 pm, edited 1 time in total.
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Re: 2 trannie/9V version of Sekova wedge fuzz (Data Dump)

Postby analogguru » Thu Mar 19, 2009 3:27 pm

Thats v2 of the Sekova Fuzz. v1 was looking inside nearly identical to the Maestro FZ-1A as can be seen in the picture below. If and which changes were made in the v2 couldn´t be determined until now, your guts will be helpfull to achieve that.

I am suspecting that (at least) the Fuzz/Attack potentiometer could be configured like in the Mica Wailer, Fuzzder and other identical units sold under different brand names. BTW, the Mica Wailer and others are derived from the Amplifier Corporation of America (ACA) Fuzz King which used this Fuzz potentiometer configuration first.

An interesting thing is that there is a connection between Sekova and Shin-ei as can be seen on the footswitch of the second picture. There were also sold US-made units under the brand of Sekova as an example the Sekova Sweep (Phase Shifter) like Sir H C has one.

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Sekova_59-v1_01inside_c.jpg
Sekova_59-v1_01inside_c.jpg (45.1 KiB) Viewed 3038 times
Sekova_2011_05_Shinei_c.jpg
Sekova_2011_05_Shinei_c.jpg (41.93 KiB) Viewed 3038 times
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