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Old 2nd April 2012, 04:59 PM   #1
M Gregg is offline M Gregg  United Kingdom
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Default Magnavox amp

OK I know why am I still here!
Just hanging about so while I'm here...I'm thinking vintage.

Possibly..

Magnavox amp....Paraphase...OK..LOL

So I have never worked on a Magnavox amp.
Why Magnavox I haven't got a clue except some people seem to think their the "best" why..?

Easy question if you were going to build a Magnavox amp and use possibly 6l6 for the O/P tubes which amp would you clone and why?

Can you point me to a circuit diagram?

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M. Gregg
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Old 2nd April 2012, 05:05 PM   #2
kevinkr is offline kevinkr  United States
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They're well regarded here in North America, and were generally simple 12AX7A 6BQ5 type SE amps, there were also 6V6 pushpull variants. It's just a very cheap way of getting into tube sound here in the 120V world. (I had one, not bad - I was 16 at the time.)

A better option for you might be something like the RH84 with Edcor or comparable Euro OPTs. (What ever you feel like budgeting)

I keep toying with the idea of designing one that "feels" like a maggie..
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Old 2nd April 2012, 05:13 PM   #3
M Gregg is offline M Gregg  United Kingdom
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Well,

I guess thats what this thread is about how to get the "Feel".
Any suggestions or ideas of components and circuits for something like 10-20Watt autobias. Its the modern "Old" magnavox...that's not just a tin of syrup..I hope..LOL

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Old 2nd April 2012, 05:16 PM   #4
TheGimp is offline TheGimp  United States
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Magnavox was probably the biggest producer of tube console stereo systems in the 50s and 60s.

Therefore they are most plentiful.
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Old 2nd April 2012, 05:20 PM   #5
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by TheGimp View Post
Magnavox was probably the biggest producer of tube console stereo systems in the 50s and 60s.

Therefore they are most plentiful.
Well,

Is it better to buy a chassis or build a Magnavox I must admit I think the idea of a build sounds interesting...Just noticed 6EU7 was used in some amps..

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Old 2nd April 2012, 06:36 PM   #6
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Quote:
Just noticed 6EU7 was used in some amps.
The triodes in a 6EU7 are identical to those in a 12AX7. The key thing about the 6EU7 is the spiral wound, hum bucking, heater that makes AC heating in a phono stage tolerable(?). The 7025 is a 'X7 variant that has the hum bucking heater too. RCA called for the 7025 in their seminal passive EQ phono preamp (schematic attached). Guess why. The current production Sovtek 12AX7LPS is a genuine 7025 equivalent, with the spiral wound heater. The 'LPS is good sounding and modestly priced.
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File Type: gif Original RCA Phono Preamp Schematic.gif (55.3 KB, 134 views)
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Old 2nd April 2012, 06:44 PM   #7
M Gregg is offline M Gregg  United Kingdom
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Just a quick question,,

Still linked to vintage sound..(If anyone knows)

Regards the N78 what difference in tone or construction with the EL84?

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M. Gregg
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Old 2nd April 2012, 06:45 PM   #8
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Eli Duttman View Post
The triodes in a 6EU7 are identical to those in a 12AX7. The key thing about the 6EU7 is the spiral wound, hum bucking, heater that makes AC heating in a phono stage tolerable(?). The 7025 is a 'X7 variant that has the hum bucking heater too. RCA called for the 7025 in their seminal passive EQ phono preamp (schematic attached). Guess why. The current production Sovtek 12AX7LPS is a genuine 7025 equivalent, with the spiral wound heater. The 'LPS is good sounding and modestly priced.
Thanks for the info..

I have a couple of 7025..LOL

I'll take a look..

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M. Gregg
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Old 2nd April 2012, 07:15 PM   #9
TheGimp is offline TheGimp  United States
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Based on my experience with three Magnavox amps and one Monarch, I'd recommend building from scratch rather than refurbishing an old amp.

1) Lots of old components need to be replaced in vintage amps.

2) The low end transformers from Edcor are as good as or better than the Magnavox and Monarch transformers I've measured.

3) Building new, you are building with known quality components and have the option of using superior parts if you wish.

4) You can purchase your power transformer to match your line voltage.

5) Proper safety concerns can be addressed from the start rather than retrofitting to an old amp.
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