Poll

What is the interest in making simple amps and preamps

I would like to make a simple line preamp
5 (11.9%)
I would like to make a simple 2-10 watt power amp
19 (45.2%)
I would like to make a phono stage
5 (11.9%)
I would like to make a MC head-amp for my existing phono system
1 (2.4%)
I am intersted in projects up to $300
2 (4.8%)
I am interested in projects up to $600
0 (0%)
I am interested in projects up to $1000
6 (14.3%)
I am interested in projects up to $1500
2 (4.8%)
I am interested in projects above $1500
2 (4.8%)

Total Members Voted: 42

Breadboard project amplifiers

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steve f

  • Full Member
  • Posts: 682
Re: Breadboard project amplifiers
« Reply #40 on: 22 Jun 2013, 04:38 pm »
Okay guys,
I can't be the only audiophile out there who enjoys building things. Roger has posted that he needs to sell about 5 of these semi-kits to make it a feasible. So come on. Join in the fun.   :D


Steve

steve f

  • Full Member
  • Posts: 682
Re: Breadboard project amplifiers
« Reply #41 on: 29 Jun 2013, 05:56 pm »
Wow, nobody else is interested. Okay, I'll forget all about EM amps and start saving for the RM 10 instead.

Steve

Roger A. Modjeski

Re: Breadboard project amplifiers
« Reply #42 on: 29 Jun 2013, 06:59 pm »
I am making a pair of EM7 monos for a customer. If anyone else wants any of the EM7 series amps now is a good time to order them. Some customization is possible such as XLR inputs, outputs, wood and finish options. If I get several orders for complete EM7 2.5 watt/ch amps or kits I will make both available. To order contact musref.roger@gmail.com

Price list: http://ramlabs-musicreference.com/pricelist.html

Roger A. Modjeski

Re: Breadboard project amplifiers
« Reply #43 on: 30 Sep 2013, 08:33 am »
We recently shipped a customized breadboard EM7 to a happy customer. We added a volume control for him.

vinylrules

  • Newbie
  • Posts: 1
Re: Breadboard project amplifiers
« Reply #44 on: 19 Oct 2013, 06:41 pm »
Hi Roger, I've just signed up and am navigating my way around the site. Wondering if you've ever thought about a truly low powered OTL amplifier. Since typical OTL amps require lots of output tubes, which leads to inevitable increases in heat and cost and also tends to reduce reliability, it seems like someone would have tried making a 5 or 10W OTL for the high impedance / high efficiency loudspeaker crowd.

Roger A. Modjeski

Re: Breadboard project amplifiers
« Reply #45 on: 22 Oct 2013, 09:41 pm »
Hi Roger, I've just signed up and am navigating my way around the site. Wondering if you've ever thought about a truly low powered OTL amplifier. Since typical OTL amps require lots of output tubes, which leads to inevitable increases in heat and cost and also tends to reduce reliability, it seems like someone would have tried making a 5 or 10W OTL for the high impedance / high efficiency loudspeaker crowd.

This question comes at an opportune time as I am in the process of designing such an amplifier. So far I have something with two output tubes and one driver tube per channel. It can provide 0.7 amps into any load up to 100 ohms. Into 8 ohms that is not much power, similar to an SET but at much lower distortion and better damping. Into 100 ohms its 25 watts. Is this what you have in mind?