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Dynaco VTA M-125 pair for sale
Dynaco VTA M-125 pair for sale
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Old 4th December 2019, 10:09 PM   #1
dahlberg is online now dahlberg  Sweden
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Default Dynaco VTA M-125 pair for sale

I'm selling my amplifiers with all related tubes included. There are a bunch of different 12au7 tubes, eight KT-120 Tungsol
and four cv378 rectifiers, also two solid state rectifiers built in sockets (Cree Sic).
The buck transformer and DC-protection circuit visible in the picture are also included.

"EUPEN GNLM 05/2.5" power cords 2m x 2 as well. If some other lenght would be prefered (within reason) that's ok.

The setting for bias have been at 1v (50mA/tube) since day one and has never been adjusted.

Build thread and additional pics here:
My KT120 / M-125's

Asking price: 2000usd (cost of parts: ~3500usd)

Mail to: bengt@dahlbergaudiodesign.se

Click the image to open in full size.
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Last edited by dahlberg; 4th December 2019 at 11:54 PM.
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Old 4th December 2019, 10:24 PM   #2
Victorinox is offline Victorinox  United States
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Sweet
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Old 4th December 2019, 10:25 PM   #3
dahlberg is online now dahlberg  Sweden
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Thanks
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Old 4th December 2019, 11:13 PM   #4
carlthess40 is offline carlthess40  United States
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Default Dynaco VTA M-125 pair for sale

Boy I would love these amps. Great job
I did not read all of your build post. Lazy and pretty sick right now
How many watts is each amp?
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Old 4th December 2019, 11:46 PM   #5
dahlberg is online now dahlberg  Sweden
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Not sure but it will depend on rectifier selection and ac main voltage. Specifications in the manual says:

Quote:
Power output (4 X KT88) 125 watts from 17 Hz to 32 KHz at less than 1% THD in ultralinear - 65 watts in triode
Power output (2 X KT88) 65 watts from 17 Hz to 34 KHz at less than 1% THD in ultralinear - 35 watts in triode
IMD .................................. < .38% (19 Khz and 20 Khz) at rated power
Frequency response ....... 10 Hz to 35 KHz +/- .1 dB at 1 watt
Power bandwidth ............ 17 Hz to 37 KHz +/- .3 dB at 125 watts
Sensitivity ....................... 1 volt in for 125 watts out
Feedback .........................10 dB
Damping factor ................14
Input impedance .............. 270,000 ohms
Hum and noise ................ > 95 dB below 125 watt output
The M-125 does not invert phase
Dimensions - 10.0" wide X 12.0" deep X 7.10" high
Weight (each) - 34 pounds > shipping weight 38 pounds
I opted for KT-120 output tubes instead, mainly to accive a longer lifespan for these tubes. KT-88 or KT-150 output tubes will work just as well the day that a replacement is needed. The ones in place now seems to be in perfect working order.

The amps have been running with different rectifiers, lately with good results the solid state Cree's. The buck transformers dropping 10v main voltage ac have been in use almost all the time so they have been at ~230v since they where added.

As you can see in the specifications they can be used with only two output tubes as well (half power output).
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Old 5th December 2019, 07:23 PM   #6
carlthess40 is offline carlthess40  United States
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Thatís some fine work and a powerful amp
Good luck on the sale. If I had the funds Iíd be sending you the cash.
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Old 6th December 2019, 02:05 PM   #7
dady is offline dady  Europe
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Send a message via MSN to dady Dynaco VTA M-125 pair for sale
I like this amp dude!
Ship to Spain?
Best Regards
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Old 6th December 2019, 04:41 PM   #8
dahlberg is online now dahlberg  Sweden
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Hello.
I can check that over the weekend (I'm working) and get back to you when I know more.
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Old 7th December 2019, 05:06 AM   #9
dahlberg is online now dahlberg  Sweden
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Shipping

Spain: 200euros

USA: 400$

Sweden: 600skr

Within 100km from UmeŚ Sweden I will drive them out myself

Buck transformers are 230v primary winding, so not for USA I guess.
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