newbie recomendations please

KevinTams · 17th October 2004, 07:12 PM

I've never built a tube amp, but I've built 3 ss amps. I have 85db rated speakers at 4 ohm (magneplanar MMG), so I reckon I need about 30 to 40 watts power. What would your recomendations be for an ambitious first tube build?

I've been following the thread on the 6c33c with some interest, would you consider this a good project?

Kev

Wodgy · 17th October 2004, 07:43 PM

The MMGs have quite a varying impedance curve, going as low as 1.6 ohms if I remember right. They're also very power hungry. A push-pull pentode amp would be your best bet. I know one guy who ran his MMGs off a vintage Fisher 400 and found it quite a good match. If you're looking for PCBs, DIYtube offers inexpensive PCBs for building a clone of the EICO HF-87/89. You might also consider building a clone of the Dynaco ST-70 or MKIII.

Geek · 18th October 2004, 08:07 AM

With such a dynamic impedance variation, I believe a good, hefty push-pull triode amp will be best. Or triode-strapped pentodes.

KevinTams · 18th October 2004, 08:21 AM

Thanks for the info, I didn't realise the MMG's were such a difficult load, I knew they were power hungry, but didn't know the impedance went down to 1.6ohms.

I'll definitely do a bit more research on the configurations you suggest
Kev

17th October 2004, 07:12 PM	#1
KevinTams diyAudio Member Join Date: Sep 2004 Location: A bloke from Stoke	newbie recomendations please I've never built a tube amp, but I've built 3 ss amps. I have 85db rated speakers at 4 ohm (magneplanar MMG), so I reckon I need about 30 to 40 watts power. What would your recomendations be for an ambitious first tube build? I've been following the thread on the 6c33c with some interest, would you consider this a good project? Kev

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17th October 2004, 07:43 PM	#2
Wodgy diyAudio Member Join Date: Jul 2003	The MMGs have quite a varying impedance curve, going as low as 1.6 ohms if I remember right. They're also very power hungry. A push-pull pentode amp would be your best bet. I know one guy who ran his MMGs off a vintage Fisher 400 and found it quite a good match. If you're looking for PCBs, DIYtube offers inexpensive PCBs for building a clone of the EICO HF-87/89. You might also consider building a clone of the Dynaco ST-70 or MKIII.

18th October 2004, 08:07 AM	#3
Geek diyAudio Member Join Date: Sep 2004	With such a dynamic impedance variation, I believe a good, hefty push-pull triode amp will be best. Or triode-strapped pentodes.

18th October 2004, 08:21 AM	#4
KevinTams diyAudio Member Join Date: Sep 2004 Location: A bloke from Stoke	Thanks for the info, I didn't realise the MMG's were such a difficult load, I knew they were power hungry, but didn't know the impedance went down to 1.6ohms. I'll definitely do a bit more research on the configurations you suggest Kev