Telescopes
astronomy
cool space pictures
earth pictures
galaxy pictures
hubble telescope images
mars pictures
pictures of the moon
nasa astronomy pictures
nebula
outer space images
pictures of stars
astronomy picture of the day
planet pictures
site map
solar system pictures
Start clusters
supernova pictures
pictures of the sun

Search:


Golden Age Project Pre-73 Mic Pre **FULLY** MODDED For Sale


Golden Age Project Pre-73 Mic Pre **FULLY** MODDED
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.



Buy Now

Golden Age Project Pre-73 Mic Pre **FULLY** MODDED:
$541.00

This takes the GAP Pre-73 to an entirely new level. This is an "As New" unit that has been completely modded and is - arguably - as close to being "Neve-like" as is possible for this model of preamp.

The mods are:

Power Supply - Both TIP122 transistors and the 7824 voltage regulator have been replaced with higher quality components and have been heat sinked properly with Mil-Spec silicone heat sink compound. The main filter caps have been replaced with Nichicon High Temperature, High Reliability, Low Impedance caps and the cheap, Chinese 5 watt resistor that tends to fail on units that remain powered on for extended lengths of time has been replaced with a Dale 6.5 watt, silicone resistor. Manypeople mod the GAP Pre-73 but often overlook the power supply - I haverepaired more units with power supply problems than any other problem; mainly due to lesser quality components that have little or no heat sink compound that are destroyed due to overheating.

Input transformer - Thestock, Chinese input transformer has been replaced with a Carnhill VTB-9045 input transformer.

Output transformer - The stock, Chinese output transformer has been replaced with a Carnhill VTB-1148 output transformer with improved 22-gauge wiring and improved Zobel components.

Drive/Output transistor - The stock transistor has been replaced with a Motorola New Old Stock (NOS) 2N3055 - date code 8052.

BC184C transistors - This unit contains (8) BC184C transistors that make up the gain stages. According tosome of the Nevedocumentation on the Internet, Neve looked for transistors with a Beta, or hfe, of 600 or greater. All 8 of the transistors in this unit have been replaced with hand matched Fairchild BC184C transistors - all with a perfectly matched Beta of 655. I had to test approximately 200 transistors to obtain enough for this unit and another unit thatI will be offering soon withtransistors that are matched within .5% The stock transistors that were removed from this unit had a wide range of Betas ranging from 458 to 603.

Tantalum capacitors - The cheap, stock Chinese electrolytic capacitors within the signal path have been replaced with solid, tantalum bead capacitors - just as Neve used. This type of capacitor will not "dry up" over time as electrolytics do.

Finally - the unit has been fully tested and rebiased utilizing the oscilloscope/signal generator method rather than simply setting a "recommended" bias voltage on the collector of the 2N3055 transistor.

Photo 2 shows the modded unit on the left and a new, stock unit on the right. Photo 3 is a close up of the modded unit.

Words cannot do justice to how great this preamp sounds. If you have been looking for a GAP Pre-73 with all of the bells and whistles - you need look no further.

This auction includes the fully modded GAP Pre-73, 120V AC power adapter, and original box. Because the unit has been modified, the manufacturers warranty is no longer valid. However, I will fully warranty the unit for 90 days . Your satisfaction is completely guaranteed. 100% positive feedback.

PayPal only, Please. Shipping is $18.99 in the US. International shipping will be quoted by request.


Buy Now

Related Items:

Search: Golden+Age
Warning: Invalid argument supplied for foreach() in /home/astro/public_html/telescopes/relateditems.php on line 72

Copyright (c) 2010 Astronomy-Pictures.net All rights reserved. Reproduction in whole or in part in any form or medium without express written permission of Astronomy-Pictures.net is prohibited.

Privacy Policy