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The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


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    Guitar Amp Built out of M-125 Iron Set

    dunwichamps
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    dunwichamps


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    • Post n°1

    Guitar Amp Built out of M-125 Iron Set Empty Guitar Amp Built out of M-125 Iron Set

    Post by dunwichamps Wed Sep 12, 2012 12:33 pm

    Since the original thread is fairly buried and this will be my last photo post on this amp I am going to start this thread for any other discussion about this amp

    It is a guitar amp built out of the iron set for a M-125 kit. Once again I am going to thank Bob for both the opportunity to buy the iron as well as many helpful emails we have exchanged about mounting and the specs of the iron. Amp should ship soon out to customer, its been a long build. just been lately waiting on this headshell to be built. I have some final gut shots available if people want them. The big circular cutout on the back is where a fan will be installed. Wrapping that up this weekend.

    Guitar Amp Built out of M-125 Iron Set 400791_349424881812124_58034377_n

    Guitar Amp Built out of M-125 Iron Set 545886_349424995145446_1101569595_n

    Guitar Amp Built out of M-125 Iron Set 310367_10151407736984552_882139908_n

    Guitar Amp Built out of M-125 Iron Set 377290_10151407764914552_86763613_n
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    Roy Mottram
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    • Post n°2

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    Post by Roy Mottram Wed Sep 12, 2012 1:48 pm

    nicely done!
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    dunwichamps
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    • Post n°3

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    Post by dunwichamps Wed Sep 12, 2012 1:50 pm

    tubes4hifi wrote:nicely done!

    thank u!

    I also believe a thanks to you is in order as I believe you are also in charge of the kits. Correct me if I am wrong.
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    OnlineBob Latino
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    • Post n°4

    Guitar Amp Built out of M-125 Iron Set Empty Re: Guitar Amp Built out of M-125 Iron Set

    Post by Bob Latino Wed Sep 12, 2012 3:29 pm

    Hi Nick,

    Looks nice ...

    How did your guitar amp work out with respect to power, the "guitar sound" etc? I ask the question because the M-125 output transformers were interleaved/layered wound with M6 laminations and designed basically for a wideband audio hi-fi amp. You are the first (and I believe the only) person ever to use that transformer pair for a guitar amp.

    Bob
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    dunwichamps
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    • Post n°5

    Guitar Amp Built out of M-125 Iron Set Empty Re: Guitar Amp Built out of M-125 Iron Set

    Post by dunwichamps Wed Sep 12, 2012 3:33 pm

    Bob

    for the kind of guitar sounds the user is going for, a hifi, large power/frequency bandwidth approach is quite apt. He is generally looking for an extremely clean amp with large headroom which he can layer on effects pedals to achieve desired distortion and other types of guitar effects. The extra bandwidth is very nice for achieving good low end response when you push the amp into overdrive and push the power beyond normal hifi expectations. Of course as we push the output further we reduce bandwidth but that is to be expected. I should mention I allow the user to switch between UL and Pentode operation where Pentode operation will increase output power with added THD, something that is not a problem for guitar sound. I was quite impressed with the M-125 iron, it does not increase in temperature too much even during heavy duty cycles at high output power.

    there actually is precedent for using hifi based designs for guitar and bass. the Sunn amp company started out taking Dynaco amps and just converting them to be used for guitar and bass. The designs slightly modded the preamp to include EQ controls but the power amps are direct or near clones of dynaco kits using dynaco iron. they had 2 x EL34, 2 x Kt88 and I believe 4 x Kt88 amps al[l based on Dynaco stuff.
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    dunwichamps
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    • Post n°6

    Guitar Amp Built out of M-125 Iron Set Empty Re: Guitar Amp Built out of M-125 Iron Set

    Post by dunwichamps Thu Sep 13, 2012 10:02 am

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    • Post n°7

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    Post by Guest Thu Sep 13, 2012 3:34 pm

    Man that came out really nice - I've been following both threads on this - great work.
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    dunwichamps
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    • Post n°8

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    Post by dunwichamps Thu Sep 13, 2012 6:15 pm

    thank you!
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    DarthBubba
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    • Post n°9

    Guitar Amp Built out of M-125 Iron Set Empty Re: Guitar Amp Built out of M-125 Iron Set

    Post by DarthBubba Sat Sep 15, 2012 7:13 pm

    dunwichamps wrote:Here is a nice hires gutshot

    https://2img.net/r/ihimizer/img38/7584/img1494bx.jpg

    Beautiful handiwork. Others should look at this picture a long time and aspire to that level of workmanship.

    Simply gorgeous.

    -DB
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    dunwichamps
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    • Post n°10

    Guitar Amp Built out of M-125 Iron Set Empty Re: Guitar Amp Built out of M-125 Iron Set

    Post by dunwichamps Mon Sep 17, 2012 5:23 pm

    DarthBubba wrote:
    dunwichamps wrote:Here is a nice hires gutshot

    https://2img.net/r/ihimizer/img38/7584/img1494bx.jpg

    Beautiful handiwork. Others should look at this picture a long time and aspire to that level of workmanship.

    Simply gorgeous.

    -DB

    thank you!
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    mantha3
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    • Post n°11

    Guitar Amp Built out of M-125 Iron Set Empty Re: Guitar Amp Built out of M-125 Iron Set

    Post by mantha3 Fri Sep 21, 2012 4:09 pm

    WOW! Hell of a good job with the wood work as well!!!

    R U building the speakers too? Post the whole stack if you are when done if you can.

    Excellent!
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    dunwichamps
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    • Post n°12

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    Post by dunwichamps Fri Sep 21, 2012 4:21 pm

    I dont build the speaker cabs or speakers but this is what is looks like on my 4x12 cabinet (read 4 12" speakers)

    The guitar is a custom made piece by a local builder, its a baritone, or a low tuned guitar. about 4 steps down from a standard E tuned guitar. The scale is extended to compensate for that low of a tuning.

    Guitar Amp Built out of M-125 Iron Set 3444_10151422730274552_173774437_n

    Guitar Amp Built out of M-125 Iron Set 255413_10151422730459552_374811204_n

    Heres the cover

    Guitar Amp Built out of M-125 Iron Set 476894_10151414313339552_1418611686_o

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    dunwichamps
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    Post by dunwichamps Sat Sep 22, 2012 9:41 am

    A youtube demo of this. It ships to customer today

    https://www.youtube.com/watch?feature=player_embedded&v=tnDXEiXVAL4

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    mantha3
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    Post by mantha3 Sat Sep 22, 2012 11:46 am

    Look at the head on that!

    Killer combo. Well done my man
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