Initial thoughts on Bolder Teac

mcgsxr · « **on:** 20 Jan 2005, 01:55 pm »

a link to my post in the Digital/Multichannel Circle.

Thanks again Wayne, for taking such good care of me, and for producing an exceptional set of mods, to take an already good amp, into great territory.

http://www.audiocircle.com/index.php?topic=16102.msg140185#140185

JLM · « **Reply #1 on:** 20 Jan 2005, 08:41 pm »

Thanks for posting Mark.

Any pictures?

Wayne,

Details, prices, lead times, comparison to other digital amps?

TIA

mcgsxr · « **Reply #2 on:** 20 Jan 2005, 09:18 pm »

JLM, in terms of pics, Wayne has posted some here.

http://www.audiocircle.com/index.php?topic=13938

mcgsxr · « **Reply #3 on:** 20 Jan 2005, 09:23 pm »

Actually JLM, I will also be posting my thoughts on a small "digital face off" at my place between the following:

1 - Stock Teac
2 - Otherwise stock Teac but with VinnieR modded power supply board
3 - Bolder Teac

Sorry, all Teacs at my place...

Wayne1 · « **Reply #4 on:** 21 Jan 2005, 03:51 pm »

This picture is of the first version that Canada Post managed to bounce around.

The Teac that Mark ended up with had a few more mods done to it.

Pretty much ALL of the power supply board capacitors were replaced with higher quality/higher value ones. An Acme Audio Silver Plated IEC was added and wired with NITRO wire. The ferrite ring was retained. The wiring to the AC switch was replaced

The power amp boards were wired so that each would only be used for one channel. The boards were modded with better caps.

The input volume board was removed. The input jacks were replaced with WBT NextGens and the output binding posts were removed and Superior Electric Binding posts were used with a custom machined adaptor plate in their place.

Mark went for a pair of MultiCaps for replacement of the chip coupling caps. They are hard wired from the RCAs direct to the amp board. The output of the amp boards are hard wired direct to the binding posts.

Lots of dampening material was added to the chassis.

I will be adding TEAC mods to my website Feb 1. There will be a few options available. The base model will have most of the power supply mods, IEC, Cardas RCAs, Vampire binding posts and mods to the amp boards. This mod will cost $400.00.

Upgrades offered will be Film Coupling caps, WBT NextGen RCAs, Superior Electric binding posts, Cryo-treated Solid Silver wiring, Slipstream Bybees, etc.

bilbobaggins · « **Reply #5 on:** 21 Jan 2005, 06:54 pm »

Does anyone know the output voltage from the power supply? I was wondering how the Teac would do with a battery power supply, if it were feasible.

Wayne1 · « **Reply #6 on:** 21 Jan 2005, 07:24 pm »

The power suppy sends out + 28 volts, +12 volts and + 5 volts.

You could try it with a couple of 12 volt SLA batteries and a couple of regulators to drop the voltage down.

JLM · « **Reply #7 on:** 22 Jan 2005, 05:02 pm »

Wonder how the sound from this amp compares to the battery Tripath amps.

How feasible is a battery version of this amp? Wayne, your previous response doesn't mean anything to me.

Wayne, how about a quality volume control and two source capability with switching on the front to make an integrated out of it?

TIA

Wayne1 · « **Reply #8 on:** 1 Feb 2005, 03:07 pm »

There are three different voltages that need to be present for the TEAC to work correctly. The 28 volts DC is needed to drive the output chip. This would provide the power for "amplifying". There are not any 28 volt batteries readily available. Two 12 volt SLA batteries might be able to be used in seris to create 24 volts. The final output power wopuld be reduced a bit by the lower voltage.

12 VDC is needed to operate the relays. The voltage can be taken off of one of the pair of 12 V SLA batteries. The 5 volts is needed by the digital controller chip. A power supply circuit would need to be scratch built to derive 5 volts form one of the 12 volt batteries. It is usually made from an IC regulator and a few capacitors.

All this is doable if someone wishes to spend the money. Add in a decent volume control, switch, input jacks and wiring and you could be looking at a $1,000.00 easy. I cannot comment on any sound issues until and if the unit gets built.