View Full Version : Monarch SA-10


yaronsa
06-18-2005, 12:51 PM
Hi
I'm new to the forum and to tube audio in general
does any one heard of a company called monarch(vintage) and a certain
model called SA-10???
Your help will be highly appriciated

tubino
06-18-2005, 01:56 PM
Hi, I've owned a couple of tube amps labeled Monarch, with SA-XX numbers. Some of the Monarchs are nice little sleepers from Japan. Some are single-ended stereo.

I just looked, and one of mine is SA-614. I think I have a couple of SA-30s.

yaronsa
06-18-2005, 02:01 PM
Thanks a lot but what did you mean by "sleeper"?
Did you meant they too weak?
and thanks again

tubino
06-18-2005, 03:25 PM
Thanks a lot but what did you mean by "sleeper"?
I meant that they aren't well-known, or well-regarded, or high-priced, or impressive looking, or sought after, but some of them perform very well.

Can you post a picture of it? What are the output tubes? Is it a stereo single-ended 6BQ5 unit? I'm guessing the SA-10 means 10 watts...

yaronsa
06-18-2005, 03:32 PM
Hi Thanks for your help
this are the details:
1960's Monarch Hi-Fidelity tube type stereo amplifier model SA-10. It has been very well cared for, It works on AC 115 volts. The tubes are: (1)12AX7, (2)35C5, (1)35W4.
I uploaded two pics
Thanks
Yaron

tubino
06-18-2005, 05:46 PM
Yaron,
You have a contender there for the tiniest stereo single-ended amplifier-- though I think I still have you beat by a little with one I have!

What you have is undeniably cute, but it's potentially dangerous. There is no power transformer, and the B+ is just straight rectified wall voltage without isolation. The heaters of all 4 tubes are in series from the line voltage. The output transformers are a little smaller than golf balls, so don't expect much juice at 40 hz.

The one I have that's possibly smaller is more dangerous, as instead of a bottom plate it has a piece of cardboard. Yes, that's how it came from the factory. I guess I ought to hook it up to some high-efficiency speakers to see what it can do...

yaronsa
06-19-2005, 01:32 AM
Hi
Thanks again for your help
Since safety is really my first priority
do you think its not safe to operate it?
is there anything i can do to make it safer and increase its power?
Thanks a lot
Yaron

Mike Stehr
06-19-2005, 03:02 AM
http://65.219.61.150/forums/showthread.php?t=31292&page=2&pp=15

I need to give the little guy a listen, it would give me a excuse to find a box and some recepticles for my isolation transformer.

Thatch_Ear
06-19-2005, 10:30 AM
You can be safe using it by making sure you are not grounded when you touch it. As far as increasing it's power there is nothing you can do but use efficient speakers. With the right speakers you have plenty of power.

yaronsa
06-19-2005, 02:00 PM
I guess this mean not being bearfooted for example
sorry for my ignorance when it comes to electricity

Thatch_Ear
06-20-2005, 07:28 AM
You ned to wear tennis shoes or something. Humans conduct electricity quite easily and if you are the path easiest to take it will. The whole chassis of that amp will be hot, so just be carefull and it won't bite you. Getting zapped is no fun, if it is plugged in keep one hand in pocket.

yaronsa
06-20-2005, 03:25 PM
Thnx for you help and patience

tubino
06-20-2005, 04:46 PM
is there anything i can do to make it safer and increase its power?
Just to make sure you heard this part: you can use an isolation transformer to be safer in operating the unit.

yaronsa
06-21-2005, 12:19 AM
I will certainaly do so now that you told me this kind of thing existed
i guess i can find it on the net
do you know of any brand that you can recommend?

yaronsa
06-21-2005, 01:07 AM
What do you think of this one is it what i need or i'm out of focus

Thatch_Ear
06-21-2005, 10:11 AM
What you want is a 120VAC in and 120VAC out. That looks like something for an electric guitar signal.

yaronsa
06-21-2005, 02:20 PM
I will keep looking