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#1
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Hart Electronics
Hi
I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny |
#2
Posted to rec.audio.tech
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Hart Electronics
schoey2k wrote:
Hi I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny If you could tell us what the kit was, we may be n a better position to advise. I have many old Wireless World circuits which Hart sold commercially, so may be able to provide the information you need. S. -- http://audiopages.googlepages.com |
#3
Posted to rec.audio.tech
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Hart Electronics
I'm afraid there are no specifics witten on the board, so i have no
idea what the specific kit was, all i know is that it's a power amplifier and requires a 0-60V supply, would a photo of it help? Danny On 21 Apr, 16:18, Serge Auckland wrote: schoey2k wrote: Hi I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny If you could tell us what the kit was, we may be n a better position to advise. I have many old Wireless World circuits which Hart sold commercially, so may be able to provide the information you need. S. --http://audiopages.googlepages.com |
#4
Posted to rec.audio.tech
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Hart Electronics
schoey2k wrote:
I'm afraid there are no specifics witten on the board, so i have no idea what the specific kit was, all i know is that it's a power amplifier and requires a 0-60V supply, would a photo of it help? Danny On 21 Apr, 16:18, Serge Auckland wrote: schoey2k wrote: Hi I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny If you could tell us what the kit was, we may be n a better position to advise. I have many old Wireless World circuits which Hart sold commercially, so may be able to provide the information you need. S. --http://audiopages.googlepages.com Photos of both sides of the board may well help, as I may be able to identify it from there. With a single-ended 60 volt supply it could be the Bailey 30 watt amp, which was designed with either +-30 volt or +60 volt supplies, but then again, it could be something else...... S. -- http://audiopages.googlepages.com |
#5
Posted to rec.audio.tech
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Hart Electronics
On 21 Apr, 17:41, Serge Auckland wrote:
schoey2k wrote: I'm afraid there are no specifics witten on the board, so i have no idea what the specific kit was, all i know is that it's a power amplifier and requires a 0-60V supply, would a photo of it help? Danny On 21 Apr, 16:18, Serge Auckland wrote: schoey2k wrote: Hi I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny If you could tell us what the kit was, we may be n a better position to advise. I have many old Wireless World circuits which Hart sold commercially, so may be able to provide the information you need. S. --http://audiopages.googlepages.com Photos of both sides of the board may well help, as I may be able to identify it from there. With a single-ended 60 volt supply it could be the Bailey 30 watt amp, which was designed with either +-30 volt or +60 volt supplies, but then again, it could be something else...... S. --http://audiopages.googlepages.com- Hide quoted text - - Show quoted text - I'm having a few problems trying to get the photos to somewhere i can link to them, but a Bailey amp rings quite a few bells, |
#6
Posted to rec.audio.tech
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Hart Electronics
schoey2k wrote:
On 21 Apr, 17:41, Serge Auckland wrote: schoey2k wrote: I'm afraid there are no specifics witten on the board, so i have no idea what the specific kit was, all i know is that it's a power amplifier and requires a 0-60V supply, would a photo of it help? Danny On 21 Apr, 16:18, Serge Auckland wrote: schoey2k wrote: Hi I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny If you could tell us what the kit was, we may be n a better position to advise. I have many old Wireless World circuits which Hart sold commercially, so may be able to provide the information you need. S. --http://audiopages.googlepages.com Photos of both sides of the board may well help, as I may be able to identify it from there. With a single-ended 60 volt supply it could be the Bailey 30 watt amp, which was designed with either +-30 volt or +60 volt supplies, but then again, it could be something else...... S. --http://audiopages.googlepages.com- Hide quoted text - - Show quoted text - I'm having a few problems trying to get the photos to somewhere i can link to them, but a Bailey amp rings quite a few bells, You can email them to me directly, and I can post them on my web site below. S. -- http://audiopages.googlepages.com |
#7
Posted to rec.audio.tech
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Hart Electronics
schoey2k wrote:
Hi I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny About 40 years ago, i remember of Hart amplifier kits being sold in the Netherlands. they were a 1:1 copy of the Quad 303 although the mechanical construction may probably be different. http://richardbrice.net/quad33&303.htm Andre |
#8
Posted to rec.audio.tech
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Hart Electronics
On 22 Apr, 21:36, none ""andre\"@(none)" wrote:
schoey2k wrote: Hi I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny About 40 years ago, i remember of Hart amplifier kits being sold in the Netherlands. they were a 1:1 copy of the Quad 303 although the mechanical construction may probably be different. http://richardbrice.net/quad33&303.htm Andre Thanks for that, as far as i can see topology of the PCB circuit is preety much the same as the quad 303 topology, there are a few little differences, like a couple of the output transistors are connected directly to the power rail rather than via a resistor, but i'd be confident to get any info i need about the PCB circuit off the quad schematic Danny |
#9
Posted to rec.audio.tech
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Hart Electronics
On 22 Apr, 21:36, none ""andre\"@(none)" wrote:
schoey2k wrote: Hi I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny About 40 years ago, i remember of Hart amplifier kits being sold in the Netherlands. they were a 1:1 copy of the Quad 303 although the mechanical construction may probably be different. http://richardbrice.net/quad33&303.htm Andre Thanks Andre, from the looks of things, the PCBs circuit topology is pretty much the same as the 303's, particularly the output stage and the bias setting, i've yet to look in enough detail how different any of the resistor values are, but i'd be inclined to trust the 303 circuit for transistor types, tell me if i'm very wrong, Danny |
#10
Posted to rec.audio.tech
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Hart Electronics
On 25 Apr, 19:09, schoey2k wrote:
On 22 Apr, 21:36, none ""andre\"@(none)" wrote: schoey2k wrote: Hi I have recently came accross an amplifier built from a kit (possibly 40 years ago), lacking it's off-board transistors, which has "Hart Electronics" etched onto the board, and also i have a box of components with a return address to Hart Electronics of Manchester, does anyone know if this company still exists in any capacity such that i could possibly find out what type of transistors to use? Danny About 40 years ago, i remember of Hart amplifier kits being sold in the Netherlands. they were a 1:1 copy of the Quad 303 although the mechanical construction may probably be different. http://richardbrice.net/quad33&303.htm Andre Thanks Andre, from the looks of things, the PCBs circuit topology is pretty much the same as the 303's, particularly the output stage and the bias setting, i've yet to look in enough detail how different any of the resistor values are, but i'd be inclined to trust the 303 circuit for transistor types, tell me if i'm very wrong, Danny- Hide quoted text - - Show quoted text - Sorry about the double message, i assumed the first one had decided not post when it hadn't appeared in a couple of days |
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